MOSCOW, October 30 - RAPSI. Polish experts have found traces of explosives amid the wreckage of the plane that crashed on April 10, 2010 in the Russian city of Smolensk, killing then-President Lech Kaczynski, Rzeczpospolita reported, citing Prosecutor General Andrzej Seremet.

Kaczynski died in the crash as the plane attempted to land at the Smolensk-North airport. In total, 96 people perished, including the president, his wife, and various top officials.

Seremet said experts from the prosecutor's office found traces of TNT and nitroglycerine on 30 passenger seats and in areas where the plane's wings connected with the fuselage during a repeat examination. Remnants of explosives were also found on the ground. The investigation was held by Poland due to its dissatisfaction with the earlier conclusions drawn by Russian experts.

The prosecutor's office has not yet made any suggestions about the origin of the explosives.

Seremet said the office will announce its position on the issue in the coming days.

The Interstate Aviation Committee (IAC) issued a final report in July 2011, stating that the crash was caused by the crew's attempt to land in a thick fog in conditions of poor visibility. The IAC also said the poor flight preparation and the inadequately skilled crew caused the tragedy.