A meteor streaked across the sky over Russia on Friday morning, causing sharp explosions and reportedly injuring around 1000 people.
Hundreds of amateur videos show an object streaking across the sky, trailing smoke, around 9:20 a.m. local time before bursting into a fireball.
The meteor caused a sonic boom from which residents in the city of Chelyabinsk, the largest in the affected region, described a shock wave that blew in doors, smashed glass and set off car alarms.
Before it entered the atmosphere, the meteor was about 15 metres in diameter and had a mass of about 7000 tons, NASA says.
NASA also said the fireball from it, which was brighter than the sun, is the biggest reported in more than a century, since a 1908 event in Siberia.
The blast released the equivalent of hundreds of thousands of tons of TNT which is more that the atomic bomb dropped Hiroshima during World War II.
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