NEW : Britain 's prime minister laments the `` terrible killings of ... the British family '' He promised British authorities will cooperate `` very closely with the French authorities '' to `` help those poor children '' and `` get to the bottom of what happened in this clearly very tragic and awful case . '' Three of the four adults killed , one a cyclist , were shot in the head , a prosecutor says . The other two victims died from gunshot wounds to their legs and arms. A younger girl was found alive and unharmed in the car where three adults were killed .
NEW : Britain 's prime minister laments the `` terrible killings of ... the British family '' Three of the four adults killed , one a cyclist , were shot in the head , a prosecutor says . The other two victims died from gunshot wounds to their legs and arms. A younger girl was found alive and unharmed in the car where three adults were killed .