From the website:
...The man was walking down 1st St NE with a tactical vest, a loaded shotgun, a tactical bow and arrow and a samurai sword in a hidden case behind his back.
His Chevy with Utah license plates came up positive for explosive traces when the dogs sniffed it. There are more weapons in the car.
Story is still developing. Looks like a good catch for the Capitol Police however...
EDIT: Found this tidbit on WUSA's comments section-
This man approached my colleague and I as we were headed to Union Station from the Russell Senate BLDG. He asked us where First Street and the Supreme Court Bldg were. He had the shotgun and sword in his hand. He looked crazy.
[Edited 2008-01-18 13:29:40]