(CNN) Twelve people were struck by gunfire at a Brooklyn park shortly after the close of a festival that drew thousands of revelers, police said.

One man died and another victim who was in critical condition has been upgraded and is stable after the shooting Saturday night in the Brownsville neighborhood, the New York Police Department said.

The wounded victims range in age from 21 to 55 years old. The slain man was identified by police Monday as Jason Pagan, 38, of Brooklyn.

The melee broke out around 11 p.m. at the park's playground, not long after the second night of the "Old Timers" festival ended.

The event features local artists and musicians. Until Saturday night, the annual festival had been a peaceful event for decades, Mayor Bill de Blasio said.

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