They were later forcibly removed from the Capitol.
Another three were arrested for carrying a pistol without a license, possession of a large capacity ammunition feeding device, possession of unregistered ammunition, local CBS affiliate WUSA9 reported.
The Metropolitan Police Department said 15 other people had been arrested on Tuesday and Wednesday in various protest-related arrests on an array ofcharges, including weapons possession and assault.
Fire officials also took 13 people to area hospitals on Wednesday from protest-related injuries.(AP)