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Eight bodies have been found after an apartment block explosion in the central Russian city of Magnitogorsk, amid fears the death toll will rise further.
Rescuers have halted their search for survivors until the unstable building is secured.
Officials in the Urals region city blamed a gas leak for the blast. Around 36 people are missing.
It will take about 24 hours to secure the building, BBC correspondents say.
Rescue workers are in a race against time to find survivors, as the daytime temperature in the industrial city is around -17C, falling further overnight.
The building was home to 120 people, and 48 flats collapsed in the blast.
“I woke up and felt myself falling,” one witness told Russian television, according to news agency AFP. “The walls were gone. My mother was screaming and my son had been buried.”
Another witness spoke of a “wave of fire” which followed the explosion.
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EPA/SPUTNIK/KREMLIN POOL
Russian President Vladimir Putin visited the city to assess the situation
Russia’s Vesti news channel says more than 50 of the block’s residents have been accounted for, including the victims.
At least 16 survivors have been evacuated from the scene, including seven children. Officials say five injured people, including two children, were taken to hospital.
The blast, at 06:02 local time (01:02 GMT) is thought to have ripped through the first floor, which houses some offices, and the seven storeys above then collapsed. Nearby flats were also damaged.
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AFP
The dangerously unstable building must be secured before the rescue can continue
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Reuters
There are more flats on either side of the collapsed block
A criminal investigation has been opened into the disaster.
The city of Magnitogorsk is about 1,695km (1,053 miles) east of Moscow.