Poland said an explosion that killed two people in a village near the border with Ukraine was probably triggered by a stray Ukrainian air defense missile, AFP reported.

Polish President Andrzej Duda said that there is no indication that this was a deliberate attack on Poland. He said it was "very likely" that the Soviet-era missile was launched by Ukraine as a result of an unfortunate accident, noting that the blame lies with Russia because of its attacks on Ukraine.

Prime Minister Mateusz Morawiecki said Poland is still analyzing the possibility of launching a NATO Article 4 procedure, but the measure does not appear to be necessary.

NATO Secretary General Jens Stoltenberg also said that there is no indication of a deliberate attack on Poland.