Arlington County Police, Virginia State Police and the Pentagon Force Protection Agency will be closing numerous routes near the Pentagon at the request of the U.S. Secret Service.

“Motorists are encouraged to make alternate travel arrangements to avoid the area around the Pentagon,” Arlington police said in a statement. “As conditions change it is possible these road closures will be broadened. Those traveling through this area should expect significant delays for the majority of the day and are strongly encouraged to avoid the area.”