MEXICO CITY — Soldiers in northern Mexico say they have seized a surprisingly large stash of the powerful opioid fentanyl from a truck near the U.S. border.

The Mexican Army’s Second Military Zone said late Monday that soldiers at a highway checkpoint found over 140 pounds (63.8 kilograms) of fentanyl on Saturday packed in plastic-wrapped bricks hidden behind sheet metal in the insulated floor of a truck trailer.

Soldiers also found three bags containing almost 30,000 pills, apparently also containing fentanyl. The driver and a youth accompanying him were detained.

Fentanyl is five to 15 times more potent than heroin.

The army said the truck was heading from Mexico City to Tijuana when it was stopped at checkpoint in San Luis Rio Colorado, near Yuma, Arizona.

Another truck was found further west along the border carrying 60.6 pounds (27.5 kilograms) of heroin.

Opium poppies are grown in Mexico while fentanyl is often imported from China and smuggled into the United States.

To put Saturday’s seizure in perspective, the Defense Department said that in the previous 4½ years, its total seizures of fentanyl had amounted to 106 pounds (48 kilograms) and about 36,000 fentanyl pills.

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