Domestic violence charges have been dropped against environmental activist Tre Arrow, who is one of 23 people running for mayor of Portland.

Arrow was arrested by Portland police on March 6 for fighting with his girlfriend. The charges were dropped at his arraignment, however, because she refused to cooperate with the investigation.

Arrow is known for camping on a nine-inch ledge for 11 days on the downtown headquarters of the U.S. Forest Service Building 12 years ago. He also was convicted on federal charges of setting fire to construction and timber equipment. He was arrested in British Columbia and returned to Oregon to face the federal arson charges.

KOIN Local 6 contributed to this story.