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Oakland police block off a street in downtown Oakland during an Occupy Oakland protest, Saturday, January 28, 2012, in Oakland, Calif. Police were in the process of arresting about 100 Occupy protesters for failing to disperse Saturday night, hours after officers used tear gas on a rowdy group of demonstrators who threw rocks and flares at them and tore down fences. (AP Photo/Beck Diefenbach)

Oakland police block off a street in downtown Oakland during an Occupy Oakland protest, Saturday, January 28, 2012, in Oakland, Calif. Police were in the process of arresting about 100 Occupy protesters for failing to disperse Saturday night, hours after officers used tear gas on a rowdy group of demonstrators who threw rocks and flares at them and tore down fences. (AP Photo/Beck Diefenbach)

Occupy Oakland

Crews cleaned up Oakland's historic City Hall on Jan. 29 from damage inflicted overnight during violent anti-Wall Street protests that resulted in about 400 arrests, marking one of the largest mass arrests since nationwide protests began last year. (AP)