WARSAW: Poland's new conservative government has shut down the website of a state investigation into the 2010 plane crash that killed President Lech Kaczynski, reopening debate over the disaster.

Law and Justice, the conservative party that took power last week, is led by Jaroslaw Kaczynski, the late president's twin brother. Kaczynski and other party leaders have disputed the findings of investigators who declared the disaster an accident.

They have suggested possible foul play by Vladimir Putin's Russia and accused EU president Donald Tusk, then the Polish prime minister, of negligence in the disaster's aftermath.

The government blocked the website this week. A government spokeswoman also said Wednesday she feels Tusk should face a top court, the State Tribunal, over his actions, but then insisted it was only her private view.