Just some some crazy footage on CNN. The reports had no explanation about what was going on, so I'll just describe what they showed.

You see a car with a smashed window parked sideways on the street in the middle of a group of protestors in front of The Gap on Market Street.

A guy with a mohawk is taking swings at a number of protestors. A protestor reaches into the car and takes the keys, at which point he is tackled by about five people who proceed to beat and kick him until he gives the keys up. Mohawk guy takes the keys and gets into the driver's seat of the car. After he closes the door protestors proceed to kick the car.

Someone get fed up with the traffic jam and drive into a "blocked" intersection?

I'd be interested in any reports on this footage if they show up.