a rescuer carrying a 11-month-old child said to have been found alive, after a gas explosion rocked a residential building in Russia's Urals city of Magnitogorsk Image Credit: AFP

Moscow - Laboring through sub-freezing temperatures, Russian rescue workers were digging into a sprawling heap of jagged rubble from a collapsed apartment building when one heard the faintest sound.

It was the sound of life.

On Tuesday, to everyone's delight and surprise, they pulled a baby boy out of the rubble alive, nearly 36 hours after the disaster that blew apart his home. His father called it "a New Year's miracle."

The building collapse in the Russian city of Magnitogorsk before dawn Monday has killed at least nine people so far, and more than 30 people who lived in the building have still not been accounted for.

Russian emergency officials say that at least four people have died after sections of the apartment building collapsed after an apparent gas explosion in the Ural Mountains region. Image Credit: AP

The collapse followed an explosion that was believed to have been caused by a gas leak.

The boy, an 11-month-old named Ivan Fokin, was in extremely serious condition, officials said, with fractures, a head injury and suffering from hypothermia after his ordeal in temperatures around minus 20 degrees Celsius.

He was flown to Moscow late Tuesday in a desperate attempt to save his life.

Although Ivan's prospects for survival appeared dire, "it's a New Year's miracle," his father Yevgeny was quoted as saying by the RT satellite TV channel.

The father was at work when his wife phoned to say the building had collapsed. She escaped the rubble with a 3-year-old son, Russian news reports said.

"I was sleeping on the couch with my older son, hugging him and the young one was sleeping in his baby bed," mother Olga Fokina said on Russian TV. "I and the older one fell down and quickly got out and I didn't know what happened to the baby bed afterward."

Rescue worker Pyotr Gritsenko said on Russian television that baby's discovery came after one of the crew heard faint cries.

Emergency Situations employees work at damaged parts of a collapsed apartment building in Magnitogorsk, a city of 400,000 people, about 1,400 kilometers (870 miles) southeast of Moscow Image Credit: AP

"They stopped all the equipment. He began to cry louder," but the crew couldn't find him, he said. A search dog was brought in and confirmed that someone was under the rubble, focusing the rescue effort.

The father said he helped rescuers dig in the rubble and "showed them a place where he approximately could be."

Regional governor Boris Dubrovsky was quoted as saying by the Interfax news agency that the child apparently had been protected by being in a crib and being wrapped warmly.

The rescue operation, aided by powerful heaters and lights, was continuing overnight into Wednesday in the city about 1,400 kilometers southeast of Moscow.

Russian President Vladimir Putin visited the accident site on Monday and went to a local hospital, where he spoke to a 13-year old-boy who had head injuries and frostbite after spending an hour under the rubble.

"You will get well soon, you are a fighter," Putin told the boy, one of five people hospitalized from the building collapse.

Russian officials say the odds of finding anyone else alive in the debris look increasingly slim, given the extreme weather.

Volunteers carry warm clothes to distribute to victims of a collapsed apartment building Image Credit: AP

In a separate Russian holiday disaster, seven people including a couple and their three children died in a house fire in the town of Orsk, 1,500 kilometers (900 miles) southeast of Moscow, Interfax reported. The fire early Tuesday is believed to have been caused by an electrical short-circuit, the report said.