"This is a special warhead. It is built in accordance with the Russian technological thought of concrete, "RIA Novosti quoted him as saying.
The Polish official suggested that it was mounted in such a way that the old model of the missile could disorient the Ukrainian air defense system.
Schroth stressed that the rocket did not carry a charge - there were no explosives in it.
On April 27, the wreckage of an unknown air military facility was discovered in northwestern Poland.
According to the RMF FM radio station, the wreckage of the object belongs to a surface-to-air missile.
Deputy Prime Minister and Minister of Defense of the Republic Mariusz Blaszczak said that the rocket that fell near the Polish city of Bydgoszcz could have arrived from the territory of Ukraine.