Oct 5, 9:03 PM EDT

Mexico seizes pseudoephedrine shipment at airport

MEXICO CITY (AP) -- Mexican authorities say they have seized 7 million pills of pseudoephedrine, the main ingredient used to make methamphetamine, at the Guadalajara airport.

The Attorney General's Office says more than 1,100 pounds (500 kilograms) of the pills were found packed in 24 boxes on a shipment from Calcutta, India.

Mexico has banned imports of pseudoephedrine to thwart methamphetamine production.

Sunday's seizure was the fourth in a month.

Three separate shipments of more than a ton each were confiscated last month at Mexico City's airport. Those also originated in Calcutta.

The U.S. Justice Department says Mexican traffickers are the main methamphetamine suppliers to the United States.

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