MOSCOW — Suspicions among some in Poland that a 2010 plane crash that killed President Lech Kaczynski and much of the country’s senior leadership was not an accident were revived on Tuesday by a disputed newspaper report suggesting that traces of explosives may have been found in the wreckage in western Russia.

A spokesman for Poland’s military prosecutor dismissed the article as “sensationalist,” saying at a news conference on Tuesday that the highly sensitive equipment that experts used to examine the wreckage frequently yielded false positive results.

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