U.S. Park Police on Sunday arrested Occupy D.C. protesters who refused to dismantle an unfinished wooden structure erected in a local park overnight.
Protesters began constructing the wooden building Saturday, but on Sunday police told them they needed a permit for such a structure and gave them an hour to disassemble it.
When the protesters failed to comply, officers on horseback moved in. Officers removed several protesters from the structure and arrested them, then started breaking down the structure.
Legba Carrefour, a participant in the Occupy D.C. protest, said 12 to 20 people had been arrested by mid-afternoon and several protesters remained on the structure in a standoff with officers. Police could not be reached for an official arrest count.
Police have closed off some of the surrounding streets.
Local authorities around the U.S. have sent in police to remove encampments set up by supporters of the Occupy Wall Street movement protesting economic injustice and corporate greed.
In Portland, Oregon, authorities said riot police moved into a downtown park area and arrested several anti-Wall Street protesters Saturday night after they refused to leave.
Occupy Portland demonstrators set up tents in the park earlier in the day and vowed to stay through the winter, defying city officials who said overnight camping would not be allowed.
Police Sgt. Pete Simpson said officers began detaining protesters around 8:30 p.m., after the park was closed a half hour early. He said several arrests were made but he didn't have an exact count.
The Portland protesters had been without an encampment since police swept through a downtown site three weeks ago.
Earlier, ffficers with the University of North Texas Police Department were trying to determine the identity of a man found dead in an empty area of the Occupy Denton campsite on Saturday, according to NBC 5 in Dallas.
Police do not suspect foul play in the death.
The campsite is still operating, but some campers could be seen packing up and leaving late Saturday night.
UNT senior and Occupy Denton protester Garrett Graham said the group is in mourning.
"This is a family and this is a community here," Graham said. "We're dealing with this loss the way a family does -- lots of condolences, a lot of emotion and a lot of love."