Israeli authorities seized tens of thousands of amphetamine pills from a truck bound for the Gaza Strip on Sunday evening and detained the driver of the vehicle for further questioning.

Police officers from the city of Kiryat Gat were called to the Tarkomia Border Crossing, near Hebron, to inspect a truck that border agents found to be suspicious.

At first glance, the truck appeared to be transporting refrigerators for consumers and commercial use, but police found that much of the appliances’ internal insulation had been removed.

Bags containing Fenethylline stimulant pills, which are classified as a controlled substance in the U.S. and are illegal in most countries in the world, were found hidden inside refrigerators.

The drugs weighed a total of 9.6 kilograms (about 21 pounds) and have a street value estimated at tens of thousand of shekels.

The pills, known as Captagon in the Middle East, are popular in the region for their stimulant effect.

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