At 7.17am on June 30, 1908, an explosion like a detonating hydrogen bomb erupted in the forests of Siberia - and until now, scientists have offered no conclusive explanation for the event.(Full story here).
Now Italian scientists claim to have found chunks of a meteorite which might have caused the blast - from seismic and magnetic scans of nearby Lake Cheko.
Lake Cheko, they claim is an impact crater for the blast - which devastated nearly 1,000 square miles of forest and was detected hundreds of miles away.
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Fragments of the impacting body have never been found, and its nature (comet or asteroid) is still a matter of debate.
'We report here results from a magnetic and seismic reflection study of a small lake, Lake Cheko, located about 8 km NW of the inferred explosion epicenter, that was proposed to be an impact crater left by a fragment of the Tunguska Cosmic Body,' say the researchers, from the University of Bologna in a paper published in Geochemistry, Geophysics, Geosystems.
They claim to have detected a stony fragment in the lake that could be a remnant of the meteorite that caused the explosion.
Seismic reflection and magnetic data revealed an anomaly close to the lake center, about 30ft below the lake floor; this anomaly is compatible with the presence of a buried stony object and supports the impact crater origin for Lake Cheko.'