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19-year-old man is killed in officer-involved shooting

Police officers stood on Melville Avenue in Dorchester Monday after a nearby officer-involved shooting. –Janelle Nanos/Globe Staff

Update: Boston Police shot and killed a 19-year-old man in Dorchester after he fired at them this afternoon, officials said.

Boston police are investigating an officer-involved shooting in Dorchester. The shooting happened on Penhallow Street shortly before 5:30 p.m.

Asraf Ali, 48, was outside working on his car when he saw a man with a gun running up Silloway Street, with two police officers chasing him on foot.