Hammersmith and Fulham council has said Parsons Green residents are returning home.

Chelsea FC have announced extra security measures for their match against Arsenal on Sunday. Parsons Green is near Chelsea’s stadium.

Find the full statement here:

The safety of all fans and visitors to Stamford Bridge is of paramount importance to the club. Following Friday morning’s incident at Parsons Green, and in order to help us fully prepare for the game, the majority of the Stamford Bridge site will remain closed until Sunday morning. This includes Stadium Tours, the Museum, Megastore and the Chelsea Health Club & Spa, while the ticket office will be operating via telephone and online only.

During that time, entrance to the site will be via the Stamford Gate entrance only.

On Sunday, we urge supporters to arrive at least one hour before kick-off to allow for extra security measures. We also request that supporters do not bring bags as this will delay your entry to the stadium.

The club continues to monitor events and liaise with the police and relevant authorities on supporter safety.

Donald Trump has spoken with Theresa May to convey his sympathies and prayers for those injured in the explosion, the White House said in a statement.

The president pledged to continue to collaborate closely with the UK to stop attacks worldwide targeting innocent civilians and to combat extremism, the statement continued.

A Downing Street spokesperson said: “President Trump called the prime minister earlier today to offer his condolences over this morning’s cowardly attack in London.”

Transport for London says the District line between Earl’s Court and Wimbledon will remain closed for the rest of the day due to the explosion at Parsons Green.

Here’s an updated version of where things currently stand:

Related: What we know so far about the London underground explosion

While there’s relief in Parsons Green that no one died today, a difficult weekend lies ahead for many people caught up in the attack. Visibly anxious parents have been collecting children from Lady Margaret school which was on lockdown most of the day and face trying to reassure some distraught teenagers, especially those who travel by tube.

But some of the joys of life are also returning. A wedding that was due to take place today in the parish church of St Dionis, which is inside the cordon, is now under way in a neighbouring parish church, according to the Rt Rev Dr Graham Tomlin, bishop of Kensington. He told the Guardian:

We had to move quite quickly because moving a wedding is a slightly complicated legal business, but we managed to make it work so the couple could get married in All Saints church, in the parish next door, and that’s going on right now. It’s a bit of a sign that life can continue and good things happen even in the middle of something really deeply evil like this.

The bishop, whose diocese includes Grenfell Tower, reflected on London’s summer of bad news. While he labelled the attempt to kill children and elderly people today as “evil”, he called for greater efforts to understand terrorists’ mentality.

It has been a really tough summer in London when you think of the London Bridge attacks, Grenfell Tower and this as well. The aim of something like this is either to cause death and injury or to cause fear and to stop people living life normally or to cause division in our communities.

We saw an awful lot of division over Grenfell for very different reasons, and the aim of this sort of thing is to cause the same division. We can’t afford that. It is important that whatever this is doesn’t divide communities against one another. There is too much division in our world right now and we don’t need more.

He continued:

Sadly this is something that has become part of life in London. While you never want to get used to it, you have to recognise these things are going to happen. Today we are deeply thankful the device didn’t go off in the way it was intended to. We must not normalise it. We have to do everything we can to support the security services and those trying to stop this.

There is a serious step to be made to try and get to the bottom of the mentality that is feeding acts like this. When someone sets out to kill, injure or maim, that is an act of evil. I don’t believe there are irredeemably evil people. But there are evil acts.

As a Christian I am told to pray for my enemies and so I do pray for the person who caused this and how their mind and their heart might be changed. There were lots of children and elderly people on that train and the thought of someone setting out to try and injure and kill children is just hard to get your head around.

Carina Heidrich, who works in Old Street, injured her feet while trying to escape the station. She said:

I just moved to Parsons Green last week. I was actually 10 minutes earlier than normal today for my commute to work.

I was on the tube when suddenly there was a bang to my left and it looked like something burning was flying towards me. It seemed to come from three carriages down from where I was. Then panic erupted and everyone just tried to get out of the tube. There were screams everywhere.

I was standing near the door so I was one of the first people to step out. There were children who were crying and who looked lost. I was wearing slippers, which weren’t the best footwear to run in, and someone stepped on my foot while trying to push past me and scraped the skin off. I just kept running and jumped the barrier. I didn’t turn around until I reached Fulham Road.

At the time I didn’t know what happened and was trying to rationalise it. I found it quite scary to have the helicopters circling for hours this morning but I think they’ve gone now.

Pupils from Lady Margaret girls’ school, which is about 100m from Parsons Green underground station and has been locked down inside the police cordon, have been let out after a highly distressing day.

Emanuella Mensah, 16, described the panic which started the day for many of the girls who travel to school on the train that was attacked:

I was right outside the corner shop when people started running [from the station]. People were shouting ‘run, run’. I saw old people, people with their kids. Then someone shouted ‘terrorist!’. More people kept coming out of the station. There were people sitting on the pavement crying and in hysterics. Schoolgirls were coming from all kinds of directions. The teachers came down and we started escorting people into school.

She said the younger children were particularly shocked and scared and that the distress carried on throughout the day.

Years seven, eight and nine, they were all on the phone trying to call their parents. People were crying everywhere. The teachers were putting them into rooms, giving them water and biscuits, trying to keep them calm. They tried to keep everyone going to their lessons but people couldn’t concentrate.

Similar stories of distress have been emerging from the Lancaster Court community centre inside the cordon, where residents said about 60 people were being cared for after being evacuated from their flats amid fears of a continuing terror threat.

Lauren Saul, 17, who has been volunteering at the centre with her family, said:

People were distraught. I have never seen people so scared. They hadn’t been told anything. They didn’t know if they were going home or if they could contact family. Some didn’t know where their family were. I know someone whose grandson was on the train and he has only just started secondary school. The tensions were very high.

In the wake of the Parsons Green incident, NHS England has highlighted its guidance for coping with stress after such occurrences.

The latest statement by the Met says that an area 50 metres in radius around Parsons Green station has been evacuated as a precaution in case the bomb left on the tube train remains unstable.

A spokesman said:

The evacuation has been necessary whilst specialist officers secure the remnants of the improvised device and ensure it is stable.

A small number of residents will be affected by the evacuation, which encompasses an area approximately 50 metres in radius. Parsons Green tube remains closed and the public are advised to continue to avoid the area.

Here’s what May said about the decision not to increase the threat level to critical:

The threat level remains at severe. That means that a terrorist attack is highly likely. But this will be kept under review as the investigation progresses. The public should go about their daily lives but remain vigilant. People who are travelling in London will see an increase armed police presence on the transport network and security will be increased.

On counter-terrorism measures she said:

The threat of terrorism that we face is severe. But by working together we will defeat them.

We do need to ensure that we are dealing with, not just the terrorist threat but with the extremism and the hate that can actually incite that terrorism. That’s why we are looking very carefully at the powers that our police and security service have to make sure they have the powers they need. But it is also why we are working with the internet companies. The home secretary has visited Silicon Valley … and next week I’ll be co-hosting a session with President Macron from France to talk about what more we can be doing to ensure that we deal with the terrorist propaganda with the hatred that is put out across the internet.

Asked about the London mayor, Sadiq Khan’s call for more police resources, May said:

We have protected police budgets. We also protected counter-terrorism policing and we have ensured that it is possible for the police to increase the number of armed police. I’m pleased to say that once again the emergency service, the police, and others responded immediately and were on the scene immediately and we thank them for their professionalism.

Sky News is reporting that a suspect has been identified by police. A press officer at Scotland Yard said they had no knowledge of this.

Another passenger on the tube was Lauren Wear, who had got on to the District line train at Parsons Green. She was at the rear of the train close to the explosion. She said:

There was a flash from the top to the bottom of the carriage.

Some people had their hair scorched and they were quite close to me.I saw people with burns on their face. When I came out if the station everyone was like looking after each other, asking if they were OK.

The emergency teams were at the station very quickly. I was very shocked. I’m still shaken. Thankfully the train was still on the platform.

Louis Hather, 21, a programmer from London, hurt his leg in the scramble to escape the train. He said:

I was facing away from the bomb when suddenly I heard screams; they were the kind of screams that tell you something serious had happened.

I immediately thought: ‘There’s been a terror attack.’ There was something about the urgency in the way people were trying to get away that made me think that. It was sheer panic.

I knew I had to get out as soon as I could so I ran towards the stairs but everyone was rushing and lots of people were falling along the way. I tried to stay up but was being pushed all over the place. There was a big crush on the stairs, with a pile-up about half way down.

People were falling over each other and being stepped on. I tried to steady myself by putting my arm against the wall. But in the end I fell over and I lost a shoe and my bag in the rush.

Somehow I managed to get out and into the street but my stuff was still inside. I heard someone say that there was a flash and a bang in the carriage and that a chemical covered the carriage.

They said there was a burning smell, like burning plastic. When it was calmer I eventually went back to get my bag and shoe back.

After that I left and sat in the park for a bit and got myself together and went home. I sprained my ankle, and my leg was cut from being dragged along the ground. I think that’s how most of injuries occurred. I know there was a guy standing near the bomb and he got away with a burnt coat and I imagine most of the injuries will be down to the crushing.

I feel OK now. I have calmed down from earlier. I have realised it’s not as bad as it could have been and we are lucky. It’s something you don’t expect to happen to you. I was just on my normal commute in and the train was rammed. We were stuck in like sardines. There were so many children going to school on that train. We are so lucky that it seems the bomb did not go off properly.

One possibility is that the detonator did not set off the main charge, causing the flash and the heat which inflicted burns on casualties but not a powerful blast which would have been much more destructive.

This has happened before: on 21 July 2005 when a series of bombs hidden in backpacks and placed on tube trains by a network of Islamic militants failed to go off.

That attack came just two weeks after 52 were killed in the 7/7 multiple suicide bombing in London targeting public transport. Police rapidly traced those responsible for the abortive attempt and detained them. Analysis found the home-made explosive they had manufactured had not ignited.

The incompetence of terrorists has been one of the key factors that has spared hundreds of lives in recent years. The recent tragic attacks in Barcelona could have been much worse if the leader of the plot had not blown himself up – along with the network’s stockpile of bomb components – hours before they occurred.

Among the many failed incidents in the UK are attempts to bomb a cafe in Exeter (that failed when a bomber set off his own device in a toilet); to bomb a nightclub in London with incendiary devices (that smouldered but did not burn), and to bring down a transatlantic passenger jet (with a bomb in a shoe that proved impossible to ignite).

In the US, a massive blast was avoided in Times Square, New York, because the bomber programmed the wrong time, while in Yemen in 2000 an attempt to sink a US navy ship failed when a dinghy overloaded with explosives sank when it was launched.

The same goes for attacks by extremists motivated by other ideologies. Well under a half of the 150 far-right plots recorded by the Anti-Defamation League in the US between 1993 and 2016 succeeded. In Columbus, Ohio, in April 2016 a rightwing extremist blew his own hands off while allegedly making explosive which authorities said was to be used as a diversion during a bank robbery.

In an incident in Spokane, Washington, in 2011, the FBI arrested a white supremacist who planted a pipe bomb on the route of a Martin Luther King Day parade. It failed to detonate.

Counter-terrorist specialists in the west recognise that the “Four Lions factor” – a reference to the 2010 black comedy by Chris Morris which shows the incompetent attempt by a group of Britons to launch a terrorist campaign – is one of the most important defences against attack.

Putting pressure on safe havens overseas to limit the ability of terrorist groups to provide training, stopping militants from travelling to those that do still exist, increasing the pressure on local networks and limiting communication with expert handlers, while of course making it harder to obtain crucial ingredients for bombs all help ensure potential attackers remain without the means to realise their destructive ambitions.

So too does the elimination of key individuals with high levels of expertise. Western and Middle Eastern intelligence agencies have been trying for years to kill Ibrahim al-Asiri, an al-Qaida extremist in Yemen responsible for a series of ingenious devices which have come close repeatedly to causing appalling destruction. One device would have brought down a passenger plane over the US in 2009 if the bomber had been able to ignite it.

Asiri is at large, despite the decade-long effort to kill or capture him. And so is whoever was responsible for the device left on the tube train in London today.

The mayor of Barcelona, Ada Colau, expressed the city’s solidarity with London, pointing out that memories of last month’s terrorist atrocities in Catalonia were still fresh.

Spain’s prime minister, Mariano Rajoy, tweeted: “I want to express Spain’s solidarity with, and support for, the British people and authorities. I hope those injured make a swift recovery.”

Supermarket Lidl has offered to help police after one of its bags was apparently used to hold the improvised bomb, PA reports.

The German-owned grocery chain issued a statement just hours after social media photos of the affected District line carriage showed a still-burning bucket inside a Lidl-branded reusable bag.

“We are shocked and concerned to have learned of an incident at Parsons Green this morning and our thoughts are with those affected,” Lidl UK said.

“We will, of course, support the authorities should they need our assistance in their investigations. We are closely monitoring the situation as it develops over the course of the day.”

The BBC security correspondent, Frank Gardner, says the security threat level could be raised from severe to critical if the intelligences services conclude that the suspected bomber is still on the loose.

Scotland Yard has confirmed that no one has been arrested so far.

The UK terrorism threat level is currently at severe, meaning an attack is highly likely. If it goes critical this would mean an attack is expected imminently.

The government’s emergency committee, Cobra, is meeting this afternoon. It is expected to make a decision about whether the threat level should change.

Here’s more on Trump’s reaction to the explosion.

Related: Donald Trump blames London train explosion on ‘loser terrorists’

Other world leaders used more diplomatic language.

In the UK, leaders past and present have added their thoughts.

The home secretary, Amber Rudd, has condemned the suspected attack as “callous and indiscriminate”.

More than 250 people were evacuated from a London Underground train not involved in the incident, the London fire brigade has revealed.

Its director of operations, Tom George, said:

“The brigade was called at 08:21 and firefighters were on the scene within three minutes. Fire crews assisted the London ambulance service in treating casualties on the affected train.

“Firefighters also helped evacuate 253 people from a train not involved in the incident. We continue to support the Metropolitan police and other services at Parsons Green.”

Both BBC and Sky News have been told that the IED had a timer fitted.

The Guardian has so far been unable to confirm these reports.

The official line from the Met is that a fire was caused by the detonation of an improvised device.

The home secretary, Amber Rudd, has joined in condemnation of the attack:

Once more people going about their everyday lives have been targeted in a callous and indiscriminate way. My thoughts are with all those injured and affected.

The police and emergency services were quickly on the scene and I would like to pay tribute again to their professionalism and tireless commitment.

I am receiving regular updates on what is an ongoing and active investigation. I would urge Londoners to remain alert and assist the police and emergency services as much as they can.

A massive search is under way for whoever planted the home-made device on the tube carriage at Parsons Green.

Detectives were examining CCTV from the London Underground network to determine where the perpetrators entered and exited the tube system.

The tube network and London generally are well covered by CCTV cameras.

The investigation, led by Scotland Yard’s counter-terrorism command and involving MI5, the domestic security service, will want to arrest those suspected of involvement in the attack before they can strike again.

The improvised explosive device will be examined by forensic experts, and may provide clues from its construction and the chemicals used to make the explosive charge.

Looking at why it did not fully detonate will give them clues as well.

Counter-terrorism investigators are looking specifically for whoever carried the device, pictured on social media as being in a bucket, on to the tube carriage. They will also want to know how it was detonated – in person or somehow remotely?

Furthermore, they will want to establish where the device was put together, and where the materials to make it were acquired from.

Other key question are whether knowledge of how to build the device was obtained from a plethora of DIY guides on the internet, or from another person.

Assistant commissioner Mark Rowley said hundreds of detectives had been drafted into the investigation.

The explosion at Parsons Green is the fifth terrorist attack to get through Britain’s defences since March 2017. Two in London and a bombing in Manchester were blamed on Islamist terrorism. A van attack in June was blamed on rightwing extremism.

The terrorism threat level is set by the joint terrorism analysis centre (JTAC), which sits within MI5. In the immediate hours after the Parsons Green incident the threat remained at severe, meaning an attack is highly likely.

It was last raised to its maximum level in May for several days, after the suicide bombing attack on Manchester Arena, as investigators tried to satisfy themselves there were no bomb-making materials or suspects still at large, and thus intending and capable of attacking again.

Similarly, after Parsons Green, senior counter-terrorism officials will want to gain control of any suspects and/or materials related to the attack.

The Met has video of that Mark Rowley statement (see earlier for the text).

South African Gillian Wixley, 36, who lives in Putney, was eight seats from the explosion. She said:

I first heard a loud bang, followed by smoke and fire rising upwards. I was about eight seats away from where the explosion happened and immediately everyone started rushing off the train. It was chaotic: things were flying everywhere and people were falling over as they got off. There was lots of people panicking and people were injured due to the crush.

It wasn’t a big explosion, more of a bang and then there was fire. It all happened very quickly.

I heard a girl screaming, ‘Get off the train!’ Everyone rushed out and as I looked back I could see flames going up the wall. I was near the back of the train but toward the front people were running towards the exit. We were more worried about doing this because moving forward would mean moving past where the fire was.

By the time I got to the stairs, for some reason they were not letting people down – maybe because of the crush of everyone trying to get out. But people were panicking and wanted to go know why they couldn’t move forward.

One woman came up and I could see that the whole of her hair on one side was singed. She was holding her ear and saying: ‘I have to get out.’ Everyone responded very swiftly and moved aside so she could get down to get help.

Everyone was very emotional. There was one boy maybe age 10 who was commuting to school on his own. He was sitting on the floor sobbing.

He was obviously in shock and very scared. Everyone around him was trying to calm him down and help him.

When I got out I sat on bench in the park. I was really in shock and everyone was just crying. I started to feel relieved I had escaped.

I had not taken my normal commute route today. I was on my way to north London today to go on a volunteering day, working in a school for disabled children. I usually go to Bank station, so I don’t take the District and Circle line. I work in the City for a bank.

I am very shaken up and still in shock about everything that happened this morning. Not looking forward to getting on a train again, but you have to just get on with things. The explosion happened on a platform, which is lucky – if you can say that. I am grateful it wasn’t wors