The 2007 killings triggered a debate over the role of defence contractors in warfare
A US appeals court has overturned a Murder Conviction for a former Blackwater security guard over the killing of 14 Iraqi civilians in 2007.
The court ordered a retrial for Nicholas Slatten, saying he should not have been tried alongside three others.
It also ruled that his convicted former colleagues Paul Slough, Dustin Heard and Evan Liberty be resentenced. They were all jailed for 30 years. The killings in Baghdad's Nisoor Square sparked international outrage.
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