CABAZON, Calif. (AP) — Emergency officials say three people were killed after two firefighting helicopters collided in Southern California while fighting a blaze in Riverside County. One of the helicopters landed safely during the accident on Sunday. Cal Fire Southern Region Chief David Fulcher says the second helicopter crashed and all three members perished, including a Cal Fire Division chief, a Cal Fire captain and a contract client pilot.” He did not identify the victims. The crash caused an additional 4-acre fire, which was extinguished. The crash is being investigated by the National Transportation Safety Board.