A giant "UFO fragment", resembling a silvery dome, has fallen from the sky near a remote village in Siberia, according to Russian media.

The U-shaped object is currently under inspection by Russian experts, after being covertly removed under cover of night from the possession of villagers who found it.

After discovering the device on Sunday, locals from the village of Otradnesnky had managed to drag the "UFO fragment" from the thick forest where it had fallen.

They attached it onto a trailer and took it through the snow to their village, where local inspectors then examined it before alerting Moscow authorities.

In an official statement, Sergey Bobrov, who found the object, agreed to keep it safe.

But following their stealthy removal of the 200-kilogram metal fragment, police have it under close guard, on orders from unnamed authorities. The device has not had its provenance confirmed as of yet.

However, the object does not come from a rocket or missile or be in any way associated with terrestrial space technology, it has been announced.

"The object found is not related to space technology. A final conclusion can be made after a detailed study of the object by experts," the Telegraph quoted Roscosmos, the Russian space agency as saying.

Experts have also examined the object to determine whether it poses a hazard.