U.S. Park Police on Thursday arrested two Occupy DC protesters at McPherson Square on charges of assaulting two police officers following an altercation in which one of the officers was left vomiting on 15th Street after being kicked in the groin.

Police arrived at McPherson Square about 2:30 p.m. in response to a reported assault on a woman, police said. Police said they found several people in the square drunk and disorderly when they arrived. Witnesses said police approached one man in a tent — a protester known only as “Tank” whose real name was not immediately released by police — and asked him to leave. He emerged and, after first refusing to speak to police, started yelling at them, protesters said.