At least eight people have died after a Russian plane on a fire-fighting mission crashed in Siberia, Russian news agencies have reported.

Rescue workers found the Ilyushin Il-76 cargo plane in the early hours of Sunday morning in Russia's Irkutsk region, according to a statement on the Emergency Situations Ministry website.

A photo accompanying the statement showed the plane smashed to pieces in dense forest, with the tail but little else intact.

RIA news agency said eight bodies had been found at the scene of the crash as well as two flight recorders, citing emergency official Leonid Belyaev. It is believed there were 10 people on board the plane, which had been missing since Friday, so the death toll could rise.

A search-and-rescue operation was launched involving land and air teams.

Russia has been criticised for its poor air safety record, and aeroplane crashes are frequent.

The multi-purpose Il-76 plane has been used by the Russian air force during Russia's military campaign in Syria.