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FIRST ON FOX: ICE Homeland Security Investigations (HSI) agents in Laredo, Texas, arrested a father and son accused of smuggling hundreds of firearms, including rifles, magazines and ammunition into Mexico after Customs and Border Protection (CBP) officers discovered hidden compartments in two trailers at the U.S.-Mexico border.

On Oct. 23, CBP officers working at the Laredo Bridge 2 Port of Entry stopped two southbound vehicles towing box trailers for inspection.

Agents said they noticed irregularities in the trailer walls.

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Multiple tables of firearms stopped from being smuggled into the U.S.

Over 400 firearms were found in two hidden compartments in trailers, officials said. (HSI Laredo )

A secondary inspection revealed false compartments packed with an arsenal: roughly 400 firearms of various calibers, high-capacity magazines and thousands of rounds of ammunition.

HSI officials said the guns were headed into Mexico, where cartels fuel ongoing violence.

"Another example of how nations working together deliver results for the people. U.S. authorities seized 400 firearms that were headed to Mexico — and arrested those responsible. Firearms that will not reach criminal hands. Shared security in action. Delivering results," U.S. Ambassador Ronald Johnson said in a statement on X.

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Smuggled firearms in truck

Photos shared to Fox News by HSI Laredo show firearms carefully packed in the sides of a trailer. (HSI Laredo)

The drivers were identified as Emilio Ramirez-Cortez, a lawful permanent resident, and his son Edgar Ramirez-Diaz, a U.S. citizen. Both were arrested on charges of federal firearms smuggling and turned over to the U.S. Marshals Service pending an initial court appearance.

Apprehended firearms in truck

In this photo provided by HSI Laredo, firearms are packed into the walls of a trailer headed for Mexico. (HSI Laredo )

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ICE said the investigation is ongoing and that additional charges or suspects may be identified later on.

ICE did not immediately respond to Fox News Digital's request for comment.