The investigation will interrogate the Polish engineers of Kaczynski's plane
On the eve of the anniversary of the plane crash near Smolensk, where Polish President Lech Kaczynski crashed on April 10, 2010, Russian investigators, with the participation of Polish prosecutors, will interrogate officials in Poland who were responsible for organizing and preparing the flight. Also, from April 16 to April 30, it is planned to interrogate the military personnel who prepared the aircraft, the crew and the release of the aircraft from the Warsaw airfield, RIA Novosti reports.