As the D.C. police clear the Capitol grounds, the mayor extends a public emergency.

As the D.C. police clear the Capitol grounds, the mayor extends a public emergency.

The mayor of Washington extended a public emergency on Wednesday night as the local police worked to secure the area around the Capitol.

“Everyone needs to clear the Capitol ground and remove themselves back to their homes states, or wherever they’re staying, and let the police do their jobs,” Mayor Muriel Bowser told reporters late Wednesday evening.

Ms. Bowser also issued an order extending the District of Columbia’s public emergency for 15 days. The order said that people who came to Washington “for the purpose of engaging in violence and destruction” had fired bricks, bricks, bottles, guns and chemical irritants. “Their destructive and riotous behavior has the potential to spread beyond the Capitol,” it said.

A number of regional police departments, as well as the National Guard, helped the Metropolitan Police Department establish a perimeter around the Capitol to help enforce an overnight curfew that took effect at 6 p.m., said Robert J. Contee, the department’s chief.