6 Injured as Police Helicopters Collide in LA Area Two police helicopters collided over a helipad Saturday, leaving five Pasadena officers and a civilian with minor injuries, officials said. Police believed the collision occurred when the rotator blades of a chopper that was landing and one that was taking off touched, Lt. Phlunte Riddle said. The collision caused the blade of one of the helicopters to fall off and its tail to break. Riddle said they included five police officers and a civilian observer in one of the two Bell OH-58A helicopters. FAA spokesman Allen Kenitzer said his agency and the National Transportation Safety Board will investigate. The collision follows a much more serious crash in Atlanta this month where two officers in a police helicopter were killed when the aircraft hit wires atop a power pole.