A gas oven had been tampered with and the man was still clutching a cigarette lighter when he was pulled from the rubble yesterday, police spokeswoman Adina Mircioane said.
"There were also other indications (that he was suicidal), such as statements he made to friends," Mircioane said.
The explosion wiped out two stories of the building and destroyed the roof. Thirteen people were hurt, three of them seriously including a 48-year-old woman pulled out eight hours after the blast.
"Rubble was falling all around and there was an enormous cloud of black smoke. Only when I was 100 meters away did I know I was safe.