It took more than two hours, and reinforcements from other law enforcement agencies, before order was restored.
Another woman and two men died during the events because of as yet unspecified medical emergencies, he said.
At least 52 people were arrested, he said, including five on weapons charges and at least 26 on the grounds of the U.S. Capitol.
Most of the arrests were for violating the 6 p.m. curfew, he said, adding that the police would circulate pictures of those sought for breaching the Capitol building.
In addition, pipe bombs were found at the headquarters of both the Republican and the Democratic National Committees and a cooler containing a long gun and Molotov cocktails was discovered on the Capitol grounds, the chief said.
Capitol, Capitol Police, city’s Metropolitan Police Department, U.S . Capitol, Republican, Democratic National Committees