U.S. National Park Service police clear protesters to erect barricades as they empty the Occupy DC encampment in McPherson Square in Washington, February 4, 2012. Police officers wearing helmets and carrying shields arrived at the site where protesters with the “Occupy” movement have been staging a demonstration since October, but it was not immediately clear whether they would evict the protesters. (REUTERS/Jonathan Ernst)

Workers inspect the inside of a tent before removing it as authorities the Occupy DC encampment at McPherson Square February 4, 2012 in Washington, DC. Police in riot gear clamped down on the Washington offshoot of Occupy Wall Street on Saturday, seizing tents and bedding from the four-month-old tent colony and arresting four protesters. (AFP PHOTO/MANDEL NGAN)