WASHINGTON -- U.S. Park Police say an Arizona man has been arrested after guns and ammunition were found inside a truck hauling a camper parked along the National Mall.

The truck was parked along the National Mall near the National Air and Space Museum Wednesday afternoon, when an officer noticed something suspicious inside. A bomb disposal unit was called in. Sgt. David Schlosser says no explosives were found, but a handgun and more than one rifle were found inside.

Schlosser says the unidentified man would be charged with unregistered ammunition and firearms offenses.

Part of the Mall and some nearby roads were closed while police investigated. Museum visitors were evacuated shortly before the 5:30 p.m. closing time, TBD reported.