The explosion on Sunday morning destroyed four of 18 apartments in the building, PAP said, quoting a local fire brigade representative.
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The prosecutor’s office said an investigation is expected to start on Monday.
“Looking at the degree of destruction of this building, it was initially assumed that it could have been a gas explosion, but we do not have certainty yet. For now, our activities are focused on the rescue operation,” a state fire service spokesman told broadcaster TVN24.
Many households in Poland use gas for cooking or heating water.
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