Defense Secretary Lloyd Austin approved the request Tuesday from the District of Columbia government and the U.S. Capitol Police, the Pentagon said in a statement Tuesday night.

The troops would be used to assist with traffic control during demonstrations expected in the city in the coming days, the Pentagon said. Four hundred Guard members from the District of Columbia Guard will be joined by 300 Guard members from other states, according to the statement.

Guard members will not carry firearms or take part in law enforcement or domestic-surveillance activities, the Pentagon said.