A Polish official told CNN on Thursday that his country would quickly launch an investigation into a rocket that landed in the Polish village of Przewodow on Tuesday.

Polish Foreign Ministry spokesman Lukasz Jasina said Poland is continuing its investigation into the incident, adding that authorities expect to receive results in the coming days.

Yasina said that Ukrainian experts would also be allowed access to the site of the incident, stressing that there must first be “some legal arrangements to create a good space for their expertise.”

Earlier on Thursday, Polish President Andrzej Duda said that Ukrainian investigators would be allowed to observe the investigation, “but when it comes to participation in the proceedings and access to documents and information, specific reasons are needed to invoke international law and international agreements.”

“Yesterday (Wednesday) we insisted that we be included in the international joint investigative commission, and already late in the evening we received confirmation. In the morning, our specialists will go there and join this community of professionals,” Zelenskyy said during a speech at the Bloomberg Forum for the new economy.

“I don’t know what happened. We don’t know for sure. The world doesn’t know. But I’m sure it was a Russian missile, I’m sure we fired from air defense systems,” Zelenskyy said. .

Yasina, who told CNN she is from the region where the rocket exploded, said the mood among her friends and neighbors was “very, very sad.”

“The Russian threat is direct not only to Ukraine, but also to Poland and other European states. This war is against all of us, against our values, against Europe, against our way of life,” he added.

The first details of the investigation into the rocket that crashed on its territory

“Today there is a lot of evidence that one of the missiles that was supposed to shoot down the Russian missile did not hit the target, the self-destruct system did not work, and this missile, unfortunately, led to the tragedy,” he said. Jakub Kumoh, head of the International Policy Department of the Office of the President of Poland Andrzej Duda.

Polish Prime Minister Mateusz Morawiecki said that the 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.”

While no one is accusing Ukraine of defending itself, Ukrainian President Volodymyr Zelenskyi said on Wednesday that he had no doubt that an explosion in Poland that killed two people was not caused by a Ukrainian missile, Reuters reported.

“I have no doubt that it was not our missile,” Ukrainian media quoted him as saying.

However, according to him, it is possible that the incident, when a rocket hit a village in the south-east of Poland, was the result of a provocation by Russia, the Polish 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.