Police in Washington said 217 protesters were arrested in the nation’s capital on Inauguration Day for assaulting police officers and rioting downtown.

Interim D.C. Police Chief Peter Newsham told reporters at a press conference on Friday that the department is certain the 400 to 500 people involved in one specific protest on 13th Street N.W. were “organized and intentional.” Demonstrators did not protest peacefully, he said. Instead, a “large percent” of the group was “armed with crowbars and hammers.”