NOGALES, AZ - Federal authorities in southern Arizona say they've seized more than 10,000 rounds of ammunition from a tractor-trailer headed to Mexico.
U.S. Customs and Border Protection officers at the Nogales Port were screening travelers Thursday night.
A 47-year-old Mexican man driving a big rig claimed he lost the key to one of the locked compartments officers wanted to search after a canine team alerted to the presence of ammunition.
Officers forced open the locked compartment and discovered the ammunition in a mixture of 9 mm, and .38- and .45-caliber rounds.
Also found were 63 magazines including an assortment, such as those used in AK47 assault rifles and high-capacity magazine drums.
The driver was arrested and turned over to U.S. Immigration and Customs Enforcement's Homeland Security Investigations. His name wasn't released.