WASHINGTON -- Police arrested a man carrying a shotgun outside the Capitol on Friday, authorities said.

The man, who was not immediately identified, was in custody, and no one was injured, U.S. Capitol Police spokeswoman Sgt. Kimberly Schneider said.

An officer first spotted the man near Union Station, about two blocks from the Capitol. The man's vehicle had "items of concern" inside and was searched, Schneider said.

Police used a robotic camera to see inside the vehicle, Schneider said, then destroyed the items inside the car with a powerful water hose.