“A knife-wielding Assailant driving a sport utility vehicle mowed down panicked pedestrians and stabbed a police officer outside Parliament on Wednesday in a deadly assault, prompting the hasty evacuation of the prime minister and punctuating the threat of terrorism in Europe.

“At least five people, including the assailant, were killed and 40 others injured in the confusing swirl of violence, which the police were calling a terrorist act.

“It appeared to be the most serious such assault in London since the deadly subway bombings more than a decade ago.

“Throughout a turbulent afternoon, ambulances, emergency vehicles and heavily armed security officers thronged the area outside Parliament, as one of the busiest sections of London was cordoned off and evacuated.”

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