Information obtained by the US indicates that the explosion caused by a Russian-made missile in south-eastern Poland on Tuesday, which killed two people, was an accident, the US ambassador has said.
Volodymyr Zelensky, the president of Ukraine, has said he has no doubts that the missile that exploded in Poland on Tuesday was not Ukrainian.
The Ukrainian Air Force said it would support the investigation into Tuesday's missile explosion in Poland "as much as possible".
US President Joe Biden has offered his "full support and assistance with Poland’s ongoing investigation" into an apparent missile explosion near the Ukrainian border on Tuesday.
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Mateusz Morawiecki, Poland's prime minister, has said a verification commission should look into potential involvement of Polish politicians into making the country overly reliant on Russian energy.
The Polish Foreign Ministry has launched an inquiry into the history of a book presented to Pope Francis by Emmanuel Macron, the French president.
Mateusz Morawiecki, the Polish prime minister, has backed opposition calls for an investigation into potential Russian influence on Polish energy policy.
Polish and Czech police officers have broken up an international gang smuggling drugs within the EU, the Central Police Investigation Bureau (CBSP) reported on Tuesday.
Police Central Investigation Bureau (CBSP) officers have arrested a further eight people as part of a nationwide investigation into extortion at a number of Polish strip clubs.