Here is a video by OakFoSho of a woman identified as Leela being assaulted by police. She is the woman with the bicycle with the trailer.
At the Fuck the Police march in Oakland on January 7, 2012, a woman and her bike were shoved to the ground. She was then surrounded by several OPD who pulled out billy clubs and pummeled her and her bike. A group of fellow protesters screamed at the cops and ran to her rescue. Though she was pulled away from the grips of the police, she and the group were chased down the street. Moments after this footage, the entire group of protesters on this street were quarantined and illegally detained there for 10 minutes before being released...since they did nothing illegal.
Here is a video of her account after the event:
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Ironically this was at a protest march to express outrage over the brutality of the police. There is another Fuck the Police March scheduled for next Saturday.