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Video posted online shows people in Halloween costumes drinking and talking on the street when shots ring out, triggering a stampede. Some people topple over metal tables and take cover behind them. Video from the aftermath shows police officers treating several people lying wounded on the ground.

"They just said they had one person in custody, and I hope he's the person," Emmitt Wilson told Fox News Digital. Wilson said his 14-year-old son Elijah Wilson was killed in the shooting.

Wilson, whose family lives in Tampa, told reporters at the scene that his son was a "good child" who was "just at the wrong place at the wrong time."

"I've been trying to tell him to stop hanging around certain people, but he haven't been listening," Wilson said.

One suspect, only identified as a male, turned himself in to police, Bercaw said. Authorities believe that a second shooter was involved.