Rescuers pull baby alive from Russian block after gas blast

Russian rescuers on Tuesday pulled a baby boy alive from the ruins of an apartment block that collapsed in a gas explosion more than a day earlier, killing at least seven people and leaving dozens missing.

"The rescuers heard crying. The baby was saved by being in a cradle and warmly wrapped up," Chelyabinsk regional governor Boris Dubrovsky wrote on his Telegram channel.

The emergencies ministry named the child as a 10-month-old boy after initial reports that the baby was a girl.

Dubrovsky posted video of rescuers pulling the child from a chink between concrete panels and running with him wrapped in a blanket to an ambulance.

The mother of the boy named as Vanya, short for Ivan, also survived the blast, RIA Novosti news agency reported, citing the emergency services.

The child is in an extremely grave condition with serious frostbite of his limbs, a head injury and multiple leg fractures and he will be evacuated for treatment in Moscow, a health ministry statement said.

Part of the 10-storey apartment building collapsed following a gas explosion on Monday morning in the industrial city of Magnitogorsk, nearly 1,700 kilometres east of Moscow in the Ural mountains.

The baby was found after rescuers were forced to temporarily halt the search for dozens of missing people in the rubble for fear the rest of the block could come down.

The child survived temperatures that fell overnight to around minus 27 degrees celsius, TASS reported.

So far the incident has claimed at least seven lives and only six survivors have been found, including a 13-year-old boy.

The Soviet-era appartment block was home to around 1,100 people. The blast completely destroyed 35 flats while 10 more were damaged. Residents left homeless were evacuated to a nearby school.

Battling the freezing temperatures, rescuers had worked through the night combing through debris and trying to stabilise the remaining walls. But on Tuesday morning, the head of Russia's emergencies ministry, Yevgeny Zinichev, said the operations had to be temporarily halted.

There is a "real threat of part of the building collapsing", Zinichev said. "It's impossible to continue working in such conditions."