The BBC's Daniel Sandford says people described a ball of fire in the sky
A big rescue and clean-up operation involving more than 9,000 workers is going on in the Ural mountains following Friday's meteor strike, Russia's emergencies ministry says.
President Vladimir Putin ordered the operation to help some 1,200 people who were injured, including 200 children, mostly by shattered glass.
The shockwave damaged an estimated 200,000 sq m (50 acres) of windows.
Russian officials put the cost of the damage at about 1bn roubles ($33m).
Power of small atomic weaponA fireball had streaked through the sky on Friday, followed by loud bangs.
A large fragment was thought to have landed in a frozen lake near Chebarkul, a town in the Chelyabinsk region. A Russian army spokesman said a crater 6m (20ft) wide had been found there.
Continue reading the main story?Start Quote
End Quote Sergei Serskov Chelyabinsk residentA huge line of smoke, like you get from a plane but many times bigger?
However, a group of six divers inspected the bottom of the lake on Saturday and discovered no fragments amid the sludge.
It is thought the search for the meteorite will be delayed until the ice melts in the spring.
Emergencies Minister Vladimir Puchkov said there was no confirmation yet that any fragments had been found across the region.
Mr Puchkov toured Chelyabinsk city on Saturday to assess the damage.
He said: "We have a special team working... that is now assessing the seismic stability of buildings. We will be especially careful about switching the gas back on."
More than 9,000 people are working to clear up the damage in the Chelyabinsk region. Most are locals, but some 1,800 people came from neighbouring regions.
Mr Putin said he had thanked God that no big fragments of the meteor - which was thought to be made of iron and travelling at some 30km (19 miles) per second - had fallen in populated areas.
It weighed about 10 tonnes when it entered the Earth's atmosphere and broke apart 30-50km (20-30 miles) above ground, according to Russia's Academy of Sciences, releasing several kilotons of energy - the equivalent of a small atomic weapon.
However, the US space agency Nasa said the meteor weighed 10,000 tonnes before entering the atmosphere, and released about 500 kilotons of energy. The atomic bomb dropped on Hiroshima in 1945 was 12-15 kilotons.
The emergencies ministry urged calm, saying background radiation levels were normal after what it described as a "meteorite shower in the form of fireballs".
Continue reading the main storyAsteroids, meteors and meteorites
- Asteroids are small bodies that orbit the Sun as the Earth does
- Larger asteroids are called planetoids or minor planets, smaller ones often called meteoroids
- Once any of these enters our planet's atmosphere, it becomes a meteor
- Many meteors break into pieces or burn up entirely as they speed through the atmosphere
- Once meteors or fragments actually hits the earth, they become meteorites
Some 50 people remain in hospital for treatment - mainly for cuts and bruises from shattered glass.
'Little explosions'The Chelyabinsk region, about 1,500km east of Moscow, is home to many factories, a nuclear power plant and the Mayak atomic waste storage and treatment centre.
The shockwave blew out windows in more than 4,000 buildings in the region.
Regional governor Mikhail Yurevich said damage was estimated at 1bn roubles but dismissed as a "journalistic spoof" reports in Russian media that people had deliberately shattered windows to claim on meteorite-related insurance.
Many children were in classrooms when the meteor fell at around 09:20 (03:20 GMT).
Video posted online showed frightened, screaming youngsters at one Chelyabinsk school, where corridors were littered with broken glass.
Chelyabinsk resident Sergei Serskov told BBC News the city had felt like a "war zone" for 20 to 30 minutes.
"I was in the office when suddenly I saw a really bright flash in the window in front of me," he said.
Footage shows an icy lake near Chebarkul, where police say part of the meteor landed
"Then I smelt fumes. I looked out the window and saw a huge line of smoke, like you get from a plane but many times bigger."
"A few minutes later the window suddenly came open and there was a huge explosion, followed by lots of little explosions."
Scientists have played down suggestions that there is any link between the event in the Urals and 2012 DA14, an asteroid which raced past the Earth later on Friday at a distance of just 27,700km (17,200 miles) - the closest ever for an object of that size.
Such meteor strikes are rare in Russia but one is thought to have devastated an area of more than 2,000 sq km (770 sq m) in Siberia in 1908.
Source: http://www.bbc.co.uk/news/world-europe-21482252#sa-ns_mchannel=rss&ns_source=PublicRSS20-sa
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