Two people are said to have died in connection with the explosion which is said to have occurred in the Polish city of Przewodów, just a couple of kilometers from the Ukrainian border.
The Polish government has not confirmed the information, but according to the AP news agency, Prime Minister Mateusz Morawiecki has called a crisis meeting.
"Prime Minister Morawiecki has urgently called a meeting with the Committee of the Council of Ministers for National Security and Defense Issues," writes the Prime Minister's spokesperson, Piotr Muller on Twitter.
The text is updated