(NewsNation) — Two men face federal smuggling charges after they were found to be carrying nearly 400 weapons inside tractor-trailers that federal immigration officials stopped on a bridge headed for Mexico, Department of Homeland Security sources confirmed.

Emilio Ramirez-Cortez, a lawful U.S. permanent resident, and his son, Edgar Ramirez-Diaz, a U.S. citizen, were arrested last week after Customs and Border Protection officers found the weapons during an inspection of the vehicles in Laredo, Texas.

NewsNation sources said an inspection of the vehicles led to agents discovering the firearms of various calibers and thousands of rounds of ammunition inside hidden compartments in the vehicles.

Agents noticed what they characterized as irregular panels on the vehicles, which led agents to

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