Police had formed a barricade; as you can see from the video, there was some sort of incident along the barricade. Pollock tried to get closer to see what was happening when a police officer reached up, grabbed her lens and tried to rip her camera away. The officer then pushed her over some bicycles.
Pollock was wearing a large press badge and as you can hear from the audio, even bystanders could tell she was part of the press. Protesters behind the bicycles pulled her to safety.
Pollock was bruised in the incident but not seriously injured. She says she never crossed the police barricade.
A larger anti-NATO protest is planned for Sunday as the summit gets underway.