Two men prepare a sculpture depicting crashed airplane prior to a ceremony marking the third anniversary of the crash in Smolensk, in front of the presidential palace in Warsaw, April 10, 2013. Poland's opposition leader laid flowers Wednesday in honour of his twin and ex-president Lech Kaczynski, who died in a jet crash in Russia three years ago that one third of Poles believe was an assassination. AFP PHOTO / WOJTEK RADWANSKI