Poland’s ambassador to NATO said the “ultimate responsibility lies with Russia” after a deadly missile landed in Poland on Tuesday, killing two people.

Speaking to CNN, Ambassador Tomasz Shatkowski said the incident would not have happened if Russia had not attacked Ukraine and committed war crimes by attacking civilian infrastructure.

“Ultimate responsibility rests with Russia,” Shatkovsky said.

An explosion on Tuesday evening in a Polish town on the border with Ukraine was caused by a Russian missile shot down on Polish territory “without any intention on either side,” Polish Prime Minister Mateusz Morawiecki said, as quoted by CNN.

• The incident in which a missile hit a village in southeastern Poland may have been the result of a provocation by Russia, Poland’s prime minister said on Wednesday.
• “We cannot rule out that the bombing of Ukrainian infrastructure near the border was a deliberate provocation carried out in the hope that such a situation might arise,” Mateusz Morawiecki said in the Polish parliament.
• “Information gathered by our services and provided by our allies indicates that the explosion in Przewodów in eastern Poland was most likely caused by the downing and destruction of a Russian missile,” he said.

Morawiecki wrote on Twitter that “there are many indications that one of these missiles fell on the territory of Poland without any intention on either side.”

Earlier, Polish President Andrzej Duda said that the rocket that landed in his country and killed two people was “probably an accident.”