Riot-clad security forces dismantled an anti-Wall Street encampment in Oakland, California, clearing out occupants and taking down tents, witnesses said.
Protesters appeared to put up little resistance, and officers were seen leading some handcuffed demonstrators away from the downtown plaza.
Officers made over 30 arrests, according to one police source.
Dozens of police in riot gear took down more than 100 tents in the early hours of Monday morning, lit by a searchlight from a helicopter overhead, as a separate line of officers kept people from entering the camp.
When the operation was finished, collapsed tents and debris lay scattered throughout the camp.
Police spokeswoman Johnna Watson told reporters that the tent area was now a crime scene, and that they should keep off the campsite.
Read more and video @: Police clear out Oakland protest camp - Americas - Al Jazeera EnglishA crime scene? Are you kidding me? A crime scene? How is democracy in action a crime scene? I hope the protesters re group and move to another location and camp or come back real soon.