The coffin of Polish President Kaszinsky who was killed in a plane crash has arrived in Warsaw

The body of Polish President Lech Kazcynski has arrived back on Polish soil after a plane crash in Russia on Saturday killed him, his wife and scores of senior Polish officials. Meanwhile Russian and Polish investigators are studying fragments of the plane that went down early on Saturday. Both black box recorders have been recovered from the site near Smolensk airport. The flight data and crew conversations are essential to determine the cause of the Tupolev's crash.