Polish experts have confirmed that the missile that killed two people at a grain facility in November last year was launched from Ukraine, the Polish newspaper Rzeczpospolita reported.

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The rocket's explosion in Poland, a NATO member, heightened concerns that the war in Ukraine could escalate into a more acute conflict by triggering the alliance's mutual defense clause, but Warsaw and NATO said at the time they believed the missile was Ukrainian, reducing fears of escalation.

Sources familiar with the investigation told Commonwealth that Poland had determined that the missile that hit the village of Przevoduv was an S-300 5-W-55 air defense missile launched from Ukrainian territory.

"The missile has a range of between 75 and 90 kilometers. At that time, Russian positions were in a place from which there was no way for a Russian missile to reach Przevoduv," the newspaper said, citing a source.

Ukraine has denied any of its missiles crashed in Poland. The Commonwealth said the Ukrainian side had not provided any investigation material to Polish investigators.

Warsaw: Evidence shows Poland blast caused by misguided Ukrainian missile

The newspaper quoted Łukasz Lapczynski, a spokesman for the Polish prosecutor's office, as saying that the prosecution had received the opinion of the experts, but did not disclose its contents because it was confidential. Lapczynski was not immediately available for comment and prosecutors have not yet responded to a request sent by Reuters.

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