Poland Plane Crash Natıonal Mournıng

epa02119812 The altar is being prepared on the eve of a commemoration ceremony for the victims of the 10 April Smolensk plane crash in Pl . J . Pilsudskiego square , Poland on 16 April 2010 . Polish President Lech Kaczynski , his wife Mariaa large group of leading Polish state officialspoliticians died at the plane crash in Smolensk , Russia , on 10 April 2010 while on their way to attend ceremonies marking the 70th anniversary of the Katyn massacre .  EPA/RADEK PIETRUSZKA POLAND OUT