"Witnesses told police that both groups left the park on foot immediately after the shooting," police said. Officers were already in route to break up the gathering, when the shooting broke out.
"They were about a block away when they heard gunshots," police said.
Emergency medical workers took 10 of the injured to hospitals. Six more of the injured made their way to hospitals by other means.
Detectives are searching for surveillance video of the shooting and suspects.
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