Pakistan, Sept. 17 -- Three people were killed and a fourth was taken to a hospital after a helicopter crashed in the Chatsworth area of Los Angeles on Tuesday evening, the Los Angeles Fire Department said in a social media post.

Four patients were assessed at the scene, with three pronounced dead and one transported to a local hospital in an unknown condition, according to the fire department. The National Transportation Safety Board and the Federal Aviation Administration will investigate the crash, the fire department said. The helicopter crash occurred after a vehicle collision in the area involving a Los Angeles Metro bus and a passenger vehicle earlier on Tuesday that killed at least two people.

According to several media reports,...