Federal agents in Detroit have seized 3,450 rounds of ammunition from a vehicle trying to enter the U.S. from Canada across the Ambassador Bridge.
U.S. Customs and Border Protection said Tuesday that the rounds were for a .22 caliber weapon and concealed beneath the front passenger seat floor mat.
A 36-year-old Canadian man entering through a trusted traveler program lane Wednesday had told authorities he had no items to declare.
A secondary inspection turned up the ammunition. He was questioned by Homeland Security and released.
The man also was issued a civil penalty and removed from the NEXUS program, which allows pre-screened travelers expedited processing by U.S. and Canadian officials.
Acting Port Director David Beculheimer says the program "allows low risk, frequent border travelers benefits not available to others."