Katyn massacre
The flight was carrying high-profile political figures to attend a ceremony commemorating the 70th anniversary of the 
, when thousands of Polish prisoners of war and civilians were killed by the Soviets. All 96 on board died. Amongst the dead were First Lady Maria Kaczyńska, several members of the lower parliamentary house known as the Sejm, Deputy Foreign Minister Andrzej Kremer, National Security Bureau head Aleksander Szczygło, and Ryszard Kaczorowski, the last President of the Polish government-in-exile.
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