Polish Air Force Tu-154 crash

WARSAW (Sputnik) - The Polish commission responsible for the re-investigation into the 2010 plane crash near Russia's Smolensk, in which then Polish President Lech Kaczynski died, said on Tuesday it had found traces of explosives on the wreckage of the aircraft and on the body of one of the victims of the accident.

Divers have discovered one of the black boxes of the Russian TU-154 plane which crashed on Sunday in the Black Sea, reported TASS, citing a source from the security forces.

At the tail end of the plane, there are two more boxes which have not been found yet.

Russian President Vladimir Putin expressed his condolences to the relatives of the people who died in the plane crash near the shores of Sochi, reported TASS.

The head of state has ordered PM Dmitry Medvedev to form a special commission which will investigate the tragic incident with the TU-154 of the military ministry.

Polish Defense Minister Antoni Macierewicz has accused Russia of being responsible for the downing the Polish presidential plane in 2010.

He described it as an act of "terrorism."