MEXICO CITY (AP) — Mexican Navy inspectors have intercepted 11,520 tequila bottles bound for export that actually contained nearly 10 tons of concentrated liquid meth, the Navy said Monday.

The discovery was made Sunday at the Pacific coast seaport of Manzanillo, the Navy said. It said the bottles contained approximately about 19,000 pounds of meth.

Photos of the seizure show a sniffer dog alerting inspectors to cardboard boxes of glass bottles full of a brownish liquid, consistent with the color of “añejo” or aged tequila. The labels on the bottles were not visible.

Mexico is the world’s only producer of authentic tequila.