It happened just before 2 p.m. Saturday at Silverado Park on West 31st Street.
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When officers arrived, they found two men with injuries and a 17-year-old boy in critical condition.
According to police, the victims were at the basketball courts when a vehicle drove past them and began shooting.
"An exchange of gunfire occurred between the vehicle and an unidentified subject in the park," said investigators in a statement.
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Information regarding a suspect or suspects was not available.
Update: After this story was first published, one of the shooting victims died. Details on the vigil to honor his memory here.