Missiles fired on Tuesday landed in the grain farm of Przewodow, a village in eastern Poland, killing two grain dryers.
The rockets launched into Poland was gathered to be Russian-made missiles.
Conflicting reports indicated that the missiles were fired by Russia forces while others claimed the missiles were straye anti rockets strikes fired by Ukraine to defend against Russia multiple missiles attacks.
NATO member countries are currently discussing the attack or accidental missiles strike.Rishi Sunak, Prime Minister of United Kingdom said he wants to “calmly find out what happened” in Poland.
Joe Biden, United States of America President, said, it’s “unlikely” the missile was fired from Russia.
The rockets fell on a Poland village close to the Ukraine border where they exploded around 3:40 pm local time on Tuesday afternoon.
Polish Foreign Ministry also said a Russian produced rocket hit a grain drying facility in the farm, and confirmed they had since summoned the Russian ambassador.
President of Ukraine, Volodymyr Zelenksy said, “Russian terror” would continue to escalate, while NATO confirmed it was monitoring the situation and closely consulting allies.
Three US officials speaking anonymously on Wednesday morning said the missile may have been fired by Ukrainian forces at an incoming Russian projectile, resulting in the explosion.
It is believed the incident could have serious ramifications because of Poland’s status as a NATO country, meaning it could potentially invoke NATO’s Article 5 – which states an attack on one member state is treated as an attack on them all.
A witness has identified those killed by the missiles as two men aged 60 and 62.
The witness said his friends were bringing the corn in from the field when they were killed.
The witness, according to Polish newspaper, Fakt, said: “I was in the barn when I heard two strange whistles, as if something flew over my barn. It was very loud, a thousand decibels.”
Rishi Sunak said it was important to “calmly ascertain exactly what happened” in Poland as he condemned the “barbaric” bombardment of Ukraine.
Sunak said: “I think we’re particularly disturbed by the continued barbaric activity of Russia in bombarding the Ukrainian people in their civilian infrastructure.
“We spoke to the foreign minister of Ukraine earlier today to express our sympathies about that and continue to offer support to Ukraine and we’re planning on speaking to President (Volodymyr) Zelensky together later today.””I think the most important thing to recognise is the reason Ukraine is having to use missiles is to defend its homeland.
“It is having to defend its homeland against an illegal and barbaric set of strikes by Russia.”
A statement from the Polish Foreign Ministry identified the missile as being made in Russia.
But Poland’s president was more cautious about its origin, saying that officials did not know for sure who fired it or where it was made.
He said it was “most probably” Russian-made, but that is being still verified.
NATO itself via its website, said: “The principle of collective defence is at the very heart of NATO’s founding treaty. It remains a unique and enduring principle that binds its members together, committing them to protect each other and setting a spirit of solidarity within the Alliance.”
Since the Alliance’s creation in 1949, Article 4 has been invoked several times, for instance by Turkey.
Consultation is a key part of NATO’s decision-making process because all decisions are made by consensus.
The consultation gives NATO an active role in preventive diplomacy by providing the means to help avoid military conflict.
The Kremlin has meanwhile denied any involvement in the incident, describing the claims as a “deliberate provocation aimed at escalating the situation”.
Ukrainian President Volodymr Zelensky decried the missile strike as “a very significant escalation” of his country’s war with Russia.
In his nightly address, the Ukrainian leader said the reported strikes, which killed two people in the Nato nation, offered proof that “terror is not limited by our state borders”.
“We need to put the terrorist in its place. The longer Russia feels impunity, the more threats there will be for everyone within the reach of Russian missiles,” Mr Zelensky said.
Rishi Sunak has spoken to Polish President Andrzej Duda and “reiterated the UK’s solidarity” with the Nato member.
A Downing Street spokesperson said: “The Prime Minister spoke to Polish President Andrzej Duda today from the G20 in Indonesia, following reports of a missile strike in Poland.
“He reiterated the UK’s solidarity with Poland as a close ally and expressed condolences for the victims and their families.
“President Duda updated on the Polish investigation efforts, and the Prime Minister offered any assistance needed to urgently establish what happened.
“The leaders agreed to remain in close contact and continue co-ordinating with our international partners, including Nato allies, on the next steps.”