A gas explosion ripped through half a duplex in Northeast Philadelphia’s Torresdale section Thursday but injured no one, officials said.

The blast was reported about 1:50 p.m. on the 4400 block of Pearson Avenue.

Police said the residence was undergoing renovation when the explosion collapsed the roof and blew out the main wall of the two-story duplex.

Firefighters quickly controlled the blaze set off by the blast. Gas to the block also was turned off.

The cause of the explosion is under investigation.