So there is a guy in a trailer on Constitution? I don't know what is more odd--the guy or the name of the Park Police spokesman?

From The Washington Post

"We still have dialogue going on right now," said U.S. Park Police spokesman Scott Fear. "We're trying to keep a safe perimeter and we're trying to maintain the safety of pedestrians and our officers."

Fear said this morning he could not confirm whether the man had explosives.

Fear also reported traffic congestion throughout the city. The police perimeter in the area has closed several main roads, and commuters trying to enter the city are finding bridges jammed. Constitution Avenue is closed from 23rd to 15th streets, NW. Fear said E Street is open, but everything south of it between 17th and 23rd Streets, NW is shut down. And 17th Street from E Street to Independence Avenue is also closed to traffic.