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A renegade skateboarding event at a popular park in San Francisco’s Mission District turned into a violent standoff with police Tuesday night, with unruly crowds throwing beer bottles and skateboards at officers in riot gear, authorities said.

The confrontation began shortly after 7 p.m., when police were called to Dolores Park to aid an injured skateboarder, said San Francisco Police Officer Grace Gatpandan.

Roughly 300 onlookers had crowded the park to watch skateboarders who had taken control of a steep street zoom down the hill.

While the rider was being treated, another skateboarder raced down the pavement and collided with a police sergeant before striking and flying over a patrol car parked toward the bottom of the hill.

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