An 18-year-old is shot and killed in a Chester housing project and a crowd of about 100 turns on police.

It was 1 a.m. Saturday morning when the call came in. A tactical team had to be called in to disperse the crowd.

From the story:

Police believe the shooting is a result of an ongoing dispute between groups from the Crosby Square Apartments and the William Penn Housing Development.

Groups? Sounds like gangs to me.