Missiles crossed into NATO member Poland, killing two people, a senior US intelligence official said on Tuesday in what could mark a serious escalation.
The weapon hit a farm in Przewodów, Lublin, near the border with Ukraine, according to Polish media reports.
Senior U.S. intelligence officials say that although not all details are clear at this time it appears a grain elevator was hit and at last two people are dead.
A Polish government spokesman did not immediately confirm the information, but said leaders were meeting on "crisis situation."
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UPDATE: SKY NEWS
Polish Prime Minister Mateusz Morawiecki has called an urgent meeting to discuss national security, a government spokesman said on Twitter.State news agency PAP said the meeting was to be held at 8pm GMT.
Latvia's deputy prime minister, Artis Pabriks, said Moscow had fired missiles that landed in Poland and sent Warsaw his condolences.
Polish media said missiles hit an area where grain was drying in Przewodow, a village in eastern Poland near the border with Ukraine.
"Firefighters are on the spot - it's not clear what has happened," said firefighter Lukasz Kucy.
Moscow launched a large number of missiles at Ukraine on Wednesday, knocking out power for seven million households.
It is unclear whether the two missiles that apparently landed in Poland were part of the same wave, but it is the first time Russian rockets are said to have reached Poland.
Poland has not been involved in the conflict, but has welcomed millions of Ukrainian refugees and has widely condemned the war.
There is no evidence a missile that slammed into a Polish border town near Ukraine was an intentional attack on his country, Poland President Andrzej Duda said Wednesday.
The missile, which killed two people in a rural area, appeared to be Russian-made, Duda said. Ukraine's weaponry includes Russian-made missiles.
“Ukraine’s defense was launching their missiles in various directions and it is highly probable that one of these missiles unfortunately fell on Polish territory,” Duda said. “There is nothing, absolutely nothing to suggest that it was an intentional attack on Poland.”
NATO Secretary-General Jens Stoltenberg, at a meeting of the military alliance in Brussels, said a preliminary analysis suggests that the incident was likely caused by a Ukrainian air defense missile fired to defend Ukrainian territory against Russian cruise missile attacks.