Although European Council president Donald Tusk only appeared in court as a witness, some officials who served under him when he was prime minister of Poland in 2010 are being sued for not ensuring the safety of President Lech Kaczynski's plane.
President Lech Kaczynski was among 96 people who died in the crash in Smolensk, western Russia in 2010. Some Poles, including the governing PiS party led by Kaczynski's twin brother Jaroslaw, believe it was not an accident.
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