An Interior Ministry officer stands guard, with a Polish airplane Yakovlev Yak-40 on the landing field in the background, near the site of a Polish government Tupolev Tu-154 aircraft crash in Smolensk April 10, 2010. Poland's President Lech Kaczynski and his wife Maria, its central bank head and the country's military chief, were among 97 people killed when their plane crashed in thick fog on its approach to a Russian airport on Saturday. REUTERS/Alexander Natruskin (RUSSIA - Tags: DISASTER TRANSPORT POLITICS)