15 February 2013
More than 400 people have been injured in Russia by an explosion caused by what seems to have been a meteor.
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Eyewitnesses describe seeing a fireball curving through the clear sky, and an extremely intense light as it passed overhead.
It seems to have been a meteor, and left a white condensation trail behind it. A couple of minutes later there was a loud bang.
The shock wave from the blast blew out windows across the region round Chelyabinsk in the Ural mountains.
People who'd rushed to look out and see what was happening were injured by flying glass.
Everyone went outside to check their neighbours were OK, and the mobile phone network collapsed, briefly overwhelmed by the volume of calls.
Click here to hear the vocabulary
people who have seen something then talked about it to the authorities or media
bending, not moving in a straight line
very bright and strong
- condensation trail
a line in the sky formed of water vapour which can be seen following an object
- shock wave
invisible force of pressure caused by an explosion
- blew out
- overwhelmed by
unable to deal with
- the volume of
the large number of