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Police officers arrests a protester in the Portland encampment Sunday, Nov. 13, 2011, in, Portland, Ore. In a tense escalation of the Occupy Portland protest, police in riot gear Sunday surrounded demonstrators in a downtown park area after hundreds of people defied the mayor's order to leave the park by midnight. By early afternoon, officers had mostly surrounded the camp where the protesters were holding a "general assembly" meeting to discuss their next moves following the eviction order. (AP Photo/Rick Bowmer)

Police move in on occupy Portland

Several hundred protesters, some wearing goggles and gas masks, marched past authorities in a downtown street Sunday, hours after riot police drove Occupy Portland demonstrators out of a pair of weeks-old encampments in nearby parks.