U.S. Customs and Border Protection (CBP) seized hundreds of pounds of illegal drugs from a commercial vehicle at a Michigan port of entry this week.

The drug seizure took place on Tuesday, April 15, at the Ambassador Bridge port of entry in Detroit, Michigan.

Officials say that a commercial vehicle headed from the U.S. to Canada was selected for a physical inspection.

During the search, CBP officers discovered two duffel bags and four moving boxes containing bricks of a powdery white substance that tested positive for cocaine.

The total weight of the seized cocaine was 339 pounds.

The cocaine, truck, and trailer were seized.

The truck driver faces federal prosecution, according to CBP.

“We work diligently to enable fair, competitive, and compliant trade and a significant part of that is stopping those who seek to exploit import and export processes for illicit gain,” said Director of Field Operations Marty C. Raybon. “With the support of our regional law enforcement partners, we will continue to hold these bad actors accountable.”

“Our ports of entry are not throughfares for illegal drugs and we will continue to hold the line against transnational criminal activity,” said Acting Port Director David Beculheimer.

The incident is under investigation by ICE Homeland Security Investigations.