A new report reveals advanced U.S. military equipment has gone missing one day after it was delivered to Poland. Investigators are currently probing the matter. Thus far, no leads have been reported.

Sputnik News reports:

US military equipment worth a combined 200,000 zloty ($56,000) was stolen from a railway container in the town of Zagan in western Poland, RMF radio station reported citing the prosecutor’s office.

The container was not transporting arms, ammunition or explosives, but did contain specialized advanced military equipment.

The case is being jointly investigated by the Wroclaw prosecutor’s office and the Military Gendarmerie.

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The incident took place just one day after US troops and military equipment arrivedin the city of Gdansk, Poland, for the deployment in eastern Europe. The vehicles that arrived in Poland include 87 M1 Abrams tanks, 103 Bradley Fighting Vehicles, 18 Paladin self-propelled Howitzers, along with other trucks and equipment, according to the Defense Department.