Polish forensic experts have found traces of explosives on the wreckage of the plane that crashed in Russia in 2010 and killed President Lech Kaczynski and 95 others, the daily Rzeczpospolita reported 30 October 2012 without citing sources.
Traces of TNT and nitroglycerin were found on up to 30 seats inside the plane, the daily reported. Traces of explosives were also found on the wings, and in the area where the plane crashed in Smolensk, Russia on April 10, 2010, the daily said.
The experts were unable to say how the traces of explosives got onto the plane. One theory says the explosive traces came from bombs from the World War II era that still remain in the Smolensk area.