One more dead body was pulled from the rubble following a household gas explosion in a five-storey apartment building in the Russian city of Novosibirsk on Friday, an emergencies source told TASS.

"The number of victims has risen to 13," the source said.

An explosion struck an apartment block in Novosibirsk at 07:43 a.m. local time (03:43 a.m. Moscow time) on Thursday, causing two sections of the building to collapse and starting a fire that engulfed the area of about 300 square meters. According to preliminary data by the emergency services, the blast was triggered by a gas leak.