Police say that the woman, 18, was trying to break up a fight between her boyfriend and the suspect when she was shot in the chest.

An 18-year-old woman was killed on a Los Angeles Metro bus after intervening in a fight; the shooting may be gang-related and the suspect is at large.

Zach Boetto reports from South Los Angeles, where a woman was shot and killed while trying to break up a fight on a Metro bus late Friday night.