Video: Bicycle demonstrators have confrontation with driver

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SEATTLE – A demonstration turned violent Friday night after a group of cyclists taking part in the Critical Mass demonstration got into an argument with a driver on Seattle's Capitol Hill.

Critical Mass is a group of cyclists that takes to the streets the last Friday of every month to promote cyclists' right to the road.

It's wasn't clear what sparked the confrontation at 15th and Aloha, but witnesses say they saw about a dozen cyclists surround a white Subaru, blocking in the driver.

"There was some screaming and yelling and crunching as he pulled out into the street," described witness Mark Pedersen.

Apparently, the driver felt intimidated and tried to back up to get away, but he backed into at least two cyclists.

He then tried to take off, but cyclists chased after him, bashed in his car window and assaulted the driver.

"There was a giant hole in the windshield... and blood around his neck," said witness Barbara Rockey.

The driver was taken to an area hospital.

The two bicyclists suffered minor injuries in the melee.

KING 5 was told there were two passengers in the Subaru. One appeared to be a pregnant woman. It was not immediately known if the passengers were injured.

It was not clear how many cyclists were arrested.

The cyclists on the scene declined to comment on what happened.