US & Canada

Skateboarders and police clash in San Francisco's Dolores Park

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Media captionA skateboarder is seen hitting a police car after a collision with an officer

Skateboarders and police have clashed in the US city of San Francisco during an informal "hill bombing" competition, reports say.

Footage show a skateboarder and an officer colliding, sending the skateboarder flying into a police car.

Skateboarders threw bottles at police in riot gear but no arrests were made, the LA Times said.

Two skateboarders and the police officer were taken to hospital, a police spokeswoman said.

There were no details about their condition.

A crowd of several hundred people had gathered to watch the skateboarders descend a steep hill in Dolores Park in the city's Mission district.

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Media captionPolice in riot gear were called

Some reports say the emergency services were called when a skateboarder fell at speed but others say residents were complaining that their street had been taken over.

After police arrived, witnesses said an officer intentionally leaned in to clip a speeding skateboarder with his shoulder, sparking anger among onlookers.

However the San Francisco Chronicle quoted a police officer as saying the collision had been an accident.

The confrontation lasted at least an hour. A police vehicle had a window broken and two vehicles were tagged with graffiti during the stand-off, a spokeswoman said.