Two Russia rockets landed in the NATO state Poland, with at least two people killed, a senior US intelligence officer confirmed.
The rockets fell and exploded in Przewodow, a village in eastern Poland, close to the Ukraine border.
Local media reports the rockets were strays and said hit some farm equipment, a grain dryer, with police and the army responding.
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The incident could have serious ramifications because Russian missiles have killed in a NATO country, during its ongoing war in Ukraine.
This is because NATO's article 5 means an attack on one member state is treated as an attack on them all, Mirror UK reports.
Ireland is not currently a NATO member and has a long-standing policy of military neutrality.
At 9pm local time, government ministers in Poland were reportedly meeting thought to be discussing the development.
Poland's Prime Minister, Mateusz Morawiecki, has convened the Committee of the Council of Ministers for National Security and Defense Affairs "as a matter of urgency", government spokesman Piotr Müller confirmed.
Polish armed forces are reportedly on ‘high alert’ and military planes were reportedly scrambled in response.
The two people who died were said to have died at the scene following the rockets landing.
Initially, local fire services confirmed an explosion in the area but it later emerged that rockets had fallen there.
Images from the impact site of the rockets show burnt and twisted farm equipment, destroyed by the rocket and a huge crater in the ground.
Further pictures show had large bits of metal debris were thrown across the area.
Reports suggest local residents heard two explosions when the rockets fell, and the area remains cordoned off as Polish authorities investigate.
Russian weapons causing the death of citizens within a NATO member state will likely raise tensions further.
Latvia's Minister of Defence, Artis Pabriks, tweeted: "My condolences to our Polish brothers in arms. Criminal Russian regime fired missiles which target not only Ukrainian civilians but also landed on NATO territory in Poland.
"Latvia fully stands with Polish friends and condemns this crime."
This comes after Russia launched a number of strikes today against the Ukrainian capital Kyiv.
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