Witness films an argument that turns into a shootout in the U.S

Chaotic rendezvous on Revere Beach, Massachusetts, over Memorial Day weekend. A video reveals a chilling scene: a young man in gray shorts and a white top breaks away from a restless group, pulls out a gun and fires seven times. A 17-year-old woman is shot in the back. The police, in a race against time, are looking for the perpetrators of this shooting, as well as another separate one.