Authorities say 11 people have been arrested in Washington's McPherson Square since Park Police began clearing away tents from one of the last remaining Occupy sites in the U.S.

David Schlosser, who is a spokesman for the U.S. Park Police, said Sunday that one of those arrested was charged with felony assault on a police officer and assault with a deadly weapon. That person is accused of hitting an officer in the face with a brick Saturday evening. The officer was treated at a hospital.

Three others were charged with assault on a police officer.

Schlosser says officials are continuing to clear the park of unsanitary conditions, though so far Sunday the situation had remained mostly peaceful.

On Saturday night, the protesters vowed to continue their movement and urged followers to remain nonviolent.