The blast happened in the city of Bergamo, Italy's ANSA news agency reported.
A 35-year-old woman and a 50-year-old man were taken to a hospital with burns to large areas of their bodies. Four other people were taken to the hospital, but were not in serious condition.
Firefighters said the explosion may have been caused by a gas leak.
Putin thinks Obama would save him if he were drowning
Members of Congress to keep receiving porn magazine