Death toll in the collapse of an apartment block of a 10-storey building in Magnitogorsk, Russia, has reached 21.
Apparently the collapse of the building was due to gas explosions in the early hours of Monday that damaged 48 apartments in the industrial city, authorities said.
At least 20 people remain missing.
The authorities said that six people including a 10-month-old child had been rescued alive since the start of the search.
Some reports suggest the explosions, two in number, may have been acts of terrorism.
An Investigative Committee said, no traces of explosives were found in the rubble.
Regional authorities announced a day of mourning in Magnitogorsk, some 1,700 kilometers east of Moscow, on Wednesday.