The traces of explosives were found on the fragments of Polish TU-154 plane that crashed on April 10, 2010, near Smolensk and killed then Polish president Lech Kaczynski, his wife and 94 other top Polish officials, Rzeczpospolita daily said.
The recent tests were conducted by "Polish prosecutors and experts" it said, but testing by Polish and Russian investigator immediately after the 2010 crash had ruled out explosive AFP reports.
The newspaper speculates there is a possibility that the TNT and nitroglycerine on 30 seats may origin from an unexploded WWII shell.
However government spokesman Pawel Gras told public TVP broadcaster that “We must wait for prosecutors to draw their conclusions and establish the source of the substance before taking any measures.”
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