U.S. Customs and Border Protection officers in Laredo seized $3.7 million in meth, according to authorities.

The seizure occurred on Nov. 25 at the World Trade Bridge when a tractor-trailer hauling a shipment of crushed marble stone was referred to secondary inspection.

Utilizing a non-intrusive inspection system and a CBP K-9 unit, CBP officers discovered 66 packages containing nearly 423 pounds of meth within the shipment.

The narcotics had an estimated street value of $3,779,994.

CBP seized the narcotics and trailer. Homeland Security Investigations special agents took over the investigation.

"This significant seizure of methamphetamine by our frontline CBP officers underscores the reality of the drug threat they face on a daily basis and exemplifies their determination and resolve to uphold CBP's priority border security mission," said Port Director Albert Flores of the Laredo Port of Entry.