Jaroslaw Kaczynski called on the country's president, prime minister and other top officials to resign over poor investigation into the plane crash in which his twin brother died.

Speaking to public in the capital Warsaw, the losing candidate in Poland's early presidential elections accused the current leadership of "waging a war against president Lech Kaczynski even after his death" by "completely abandoning" an investigation into the tragedy in western Russia, which left 96 people dead five months ago.

"People like [President] Bronislaw Komorowski, [Prime Minister] Donald Tusk, [Foreign Minister] Radoslaw Sikorski and [National Defense Minister] Bogdan Klich must disappear from the Polish political arena once and for all," Kaczynski said.

He also hinted that "a foreign state" was involved into attempts to prevent his twin brother from paying a private visit to Russia on the anniversary of the Katyn tragedy.

A Soviet-made Tu-154 Kaczynski and about 90 top state officials crashed en route to the western Russian city of Smolensk on April 10, killing everyone on board. The high-ranking delegation was due to attend a memorial ceremony for the victims of the 1940 Katyn massacre, in which Soviet secret police killed thousands of Polish military officers.

WARSAW, September 11 (RIA Novosti)