Several dozen people also were hurt in the blaze in Jilin province's Mishazi township, which appeared to have been sparked by three early morning explosions, the official Xinhua News Agency said.
Earlier, authorities had said that four people had died and two were missing in the blast at the Village Green Apartments in Upper Moreland Township, in Montgomery County.
This township of about 40, 000 people is serving as something of a test case as communities across the nation grapple with the prospect of arming school-security guards after 20 elementary schoolchildren were shot dead in Connecticut.