US police have raided Occupy Wall Street camps in Los Angeles and Philadelphia, arresting protesters and tearing up their tent cities. In Los Angeles, dozens of officers in riot gear took part in the late-night operation outside City Hall - two days after an eviction deadline had passed. In Philadelphia, nearly all of the demonstrators left before the police started pulling down tents. The evictions appeared to have been carried out without any major violence. \'Walk the walk\' In Los Angeles, protesters who refused to leave were pulled out one by one from the two-month-old camp by police.One of the demonstrators was reportedly wrestled to the ground, with the crowd shouting: \"Police brutality!\" Some protesters sat in a circle on the lawn outside City Hall, their arms interlinked, saying they would rather be arrested than leave. \"It\'s easy to talk the talk, but you gotta walk the walk,\" Opamago Cascini was quoted as saying by the Associated Press news agency. But by Wednesday morning much of the camp was deserted, with tents strewn over the grass. Los Angeles Mayor Antonio Villaraigosa earlier said he hoped to avoid the confrontations between police and protesters that have marred evictions in other cities. Mr Villaraigosa issued the eviction order, saying the camp was unsustainable because public health and safety could not be maintained. In Philadelphia, police started breaking up the camp late at night after repeatedly warning the protesters to leave. Most of the campers agreed to leave voluntarily, and dozens of them later staged a rally on a nearby street. City officials earlier said the camp must be cleared to make room for a renovation project. The Occupy Wall Street demonstrators have staged rallies in a number of US cities since the movement against inequality began two months ago.