Wednesday marks exactly 14 years since a Polish plane carrying President Lech Kaczyński, his wife and 94 others, including top political and military figures, crashed near Smolensk, western Russia, killing all those on board.
Officials are expected to lay wreaths at a statue commemorating the late president in central Warsaw and at a separate monument unveiled in 2018 to honour all 96 victims of the disaster.
Tributes will also be paid to the late presidential couple in the crypt at Wawel Cathedral in the southern city of Kraków where they are laid to rest.
A raft of other ceremonies are scheduled for the day.
Poland's President Andrzej Duda and government and parliamentary leaders are expected to attend the commemorations.
Jarosław Kaczyński, the head of Poland’s opposition conservative Law and Justice (PiS) party and the late president’s twin, is due to lead a march of remembrance in Warsaw in the evening, public broadcaster Polish Radio’s IAR news agency reported.
The officials on the ill-fated flight had been on their way to commemorate some 22,000 Polish prisoners of war and intellectuals who were killed in the spring of 1940 on orders from top Soviet authorities in what is known as the Katyn Massacre.
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Source: IAR, PAP, president.pl