Moscow -- Russian rescuers on Tuesday pulled an infant boy alive from the rubble of an apartment building, some 35 hours after a collapse that killed at least nine people and left dozens missing. They found the baby after hearing cries amid the debris.

A section of the 10-story building in the city of Magnitogorsk collapsed on Monday following an explosion believed to have been triggered by a natural gas leak. The child, who officials initially said was a girl, was seriously injured and his recovery prospects were unclear.

A still image taken from video footage shows a rescuer carries a baby found alive in the rubble of a Russian apartment block that partially collapsed after a suspected gas blast in Magnitogorsk, Russia January 1, 2019. HANDOUT / REUTERS

The boy's mother survived the collapse and went to a local hospital to identify him, state news agency Tass reported, citing the regional emergencies ministry. The child will be evacuated to Moscow by airplane for further treatment, Tass said.

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Russian rescue crews pulled two more bodies from the rubble on Tuesday, bringing the death toll to nine.

The regional emergency ministry said earlier Tuesday that 37 residents of the building had not been accounted for. Hopes of finding survivors were dimmed by the harsh cold: Temperatures overnight were around 0 Fahrenheit.

"The child was saved because it was in a crib and wrapped warmly," regional governor Boris Dubrovsky was quoted as saying by the Interfax news agency.

Rescue crews had temporarily halted their search while workers tried to remove or stabilize sections of the building in danger of collapse.

Five people were hospitalized with injuries from the collapse in the city about 870 miles southeast of Moscow, the emergency ministry said.

In a separate holiday period disaster, seven people including a couple and their three children died in a house fire in in the town of Orsk, about 900 miles southeast of Moscow, the Interfax news agency said. The fire early Tuesday is believed to have been caused by an electrical short-circuit, the report said.