09/17/2013 04:26 EDT | Updated 11/17/2013 05:12 EST

US border agents find 3,450 rounds of ammunition in Canadian man's vehicle

DETROIT - U.S. federal agents have seized 3,450 rounds of ammunition after they say a Canadian man tried to drive into the U.S. from Canada across the Ambassador Bridge.

U.S. Customs and Border Protection says the rounds were for a .22-calibre weapon and concealed beneath the front passenger seat of the vehicle's floor mat.

They say a 36-year-old man entering through a trusted traveller program lane last Wednesday had told authorities he had no items to declare but that a secondary inspection turned up the ammunition.

U.S. officials say he was questioned by Homeland Security and released.

They say the man also was issued a civil penalty and removed from the NEXUS program, which allows pre-screened travellers expedited processing by U.S. and Canadian officials.

Acting Port Director David Beculheimer says the program "allows low risk, frequent border travellers benefits not available to others."