10th of April 2010 Polish Air Force plane crashed near the Smolensk in Russia, killing Poland's President Lech Kaczyński, his wife Maria Kaczyńska, chief of the General Staff of the Polish Army and senior military officers and other officials who were on board. Died 89 persons - elite od Polish intelligence, representatives of Polish priesthood and other meritorious people.They were on their way to mark the 70th anniversary of the Katyn massacre, which was a mass murder of more than 20,000 Polish prisoners of war (primarily military officers), intellectuals, police officers, and other public servants by the Soviet NKVD in 1940.