But did they blog home?

Russian scientists claim to have discovered the wreck of an alien device at the site of an unexplained explosion in Siberia almost 100 years ago, the Interfax news agency has reported.

The scientists, who belong to the Tunguska space phenomenon public state fund, said they found the remains of an extra-terrestrial device that allegedly crashed near the Tunguska river in Siberia in 1908.

They also claim to have discovered a 50 kilogram rock which they have sent to the Siberian city of Krasnoyarsk for analysis.

The blast in Tunguska, a desolate part of Siberia, remains one of the 20th century's biggest scientific mysteries.

On June 30, 1908, what is widely believed to be a meteorite exploded a few kilometres above the Tunguska river, in a blast that was felt hundreds of kilometres away and devastated more than 2,000 square kilometres of Siberian forest.