Each weighs more than 20 tons and police suspect they were stolen for scrap metal.
The T-34 and T-55 tanks were taken Tuesday night from the range at Jagodne in eastern Poland.
Police spokeswoman Anna Smarzak said Thursday that three of the World War II-era tanks were found at a private car park in Lublin. The other was found aboard a trailer en route to a steel mill. The tanks had been stripped of their engines long ago.
Smarzak says that two suspects from the nearby city of Lublin were being detained and questioned.
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