WARSAW 

Poland’s Ministry of Foreign Affairs said early Wednesday that the missiles which fell on a village in the country’s east, killing two people, were Russian made.

Foreign Minister Zbigniew Rau summoned the Russian ambassador to the Ministry of Foreign Affairs with a demand to provide a detailed immediate explanation.

A US intelligence official had earlier said that the missiles were Russian, according to the Associated Press.

Ukrainian President Volodymyr Zelenskyy accused Russia of deliberately attacking Poland.

"This is a Russian missile attack on collective security," he said. "This is a very significant escalation. We must act…(It is) only a matter of time before Russian terror goes further,” he said.

According to unconfirmed information in the Polish media, two variants are being checked: one, that the Ukrainian military shot down a missile and it changed course, and two, there was a Russian programming error.

State news agency Ria Novosti cited a Russian military expert who claimed that Russian cruise missiles “would not have been able to reach Polish territory, but Ukrainian S-300 (surface-to-air) missile systems, functioning abnormally, could.”

Russia’s Ministry of Defense posted a statement on its Telegram channel saying that this is "a deliberate provocation in order to escalate the situation."