BRATISLAVA, Slovakia (AP) — Slovakia has seized 1.5 tons of methamphetamines, with an estimated street value of some 2 billion euros ($1.7 billion), which was being smuggled into the country and originated in Mexico, officials said Thursday.

The seizure was described by Slovak authorities as the country's largest-ever.

Officials said that the drugs were found at the end of May with the help of Hutch, a service dog employed by the country’s financial administration, after customs officials became suspicious about the contents of two large metal containers for transporting liquids.

The shipment arrived in Slovakia by way of a Croatian port and is thought to have been destined to be sold throughout the European Union.

Inspectors drilled holes at the bottom of the tanks and found large amounts of a white crystalline substance later identified as methamphetamine.

Slovakia’s National Criminal Agency is investigating the case.