In the late evening of January 7, 2016, in a sudden attack with no precipitating event, Edward Archer rushed towards and shot Philadelphia police officer Jesse Hartnett while he drove his patrol car, inserting the gun into the window of the car and firing at point blank range. Despite being shot multiple times in the left arm, Hartnett was able to exit his car and shoot the fleeing suspect. Later in the hospital, Archer claimed he pledged allegiance to ISIS. The Federal Bureau of Investigation (FBI) investigated the shooting as a terrorist attack.