Watch the moment an unexplained orange glow set the sky alight above a remote region of central Russia.
Experts have not been able to explain the strange phenomenon.
Scientist Viktor Grokhovsky, a member of the meteorites committee of the Russian Academy of Sciences, said he believed it was a massive meteor.
However, a meteor-watching blog quotes Marco Langbroek of the Dutch Meteor Society, who said it was not a meteor because the light was stationary.
Other theories include it was the explosion of a nearby chemical plant or military setting off ammunition. However, the military press service told a news site no exercises or training took place.
Mysterious fiery flash illuminates the night sky - BT