Russian scientists hopeful of finding traces of cosmic matter left after the explosion.
Filmed here over the city of Omsk, the meteor - or was it a rocket or test firing of a ballistic missile? - startled people over a swathe of territory.
Video shows mystery object blazing a trail across the dark early morning sky.
Scientists give startling theory for 1908 Tunguska Event in Siberia which had force of 185 Hiroshima bombs.
Blast-off was 'successful' but first planned communication session 'failed' and craft did not reach 'target orbit'.
Expedition by leading chemistry institute finds area where it fell.
Flash seen over thousands of kilometres but scientists disagree over the cause.
Military strikes from air not ruled out to move giant landslide blocking Bureya River causing flood threat to villages.
Reindeer herders find more craters in the far north in a deepening puzzle for scientists.
When Vadim Kolpakov went on an expedition to the north of Irkutsk region, he had no inkling of the sensational discovery he was about to make.