At least seven people have now died after the blast destroyed four residential buildings on Saturday evening in the Sicilian town of Ravanusa.
Firefighters say they are continuing to search the rubble for two people still said to be missing.
Another 100 people have had to leave their homes because of the explosion.
Authorities said four houses had collapsed and another three were damaged during the blast, which was heard as far as four miles (6km) away.
