President Lech Kaczynski and scores of other senior Polish figures have been killed in a plane crash in Russia. Polish and Russian officials said no-one survived after the plane apparently hit trees as it approached Smolensk airport in thick fog. Russian media reports said the pilots ignored advice from air traffic control to divert to another airport. Poland's army chief, central bank governor, MPs and leading historians were among more than 80 passengers. Prime Minister Donald Tusk said the crash was the most tragic event of the country's post-World War II history. The Polish delegation was flying in from Warsaw to mark the 70th anniversary of the Katyn massacre of thousands of Poles by Soviet forces during WWII.