In Poland, officials said, a black box voice recording from the plane which crashed in Russia revealed that the pilots knew they were about to crash. <br/><br/>Polish Chief Prosecutor Andrzej Seremet said, it was clear the crew knew disaster was inevitable after the plane hit tree-tops. <br/><br/>Poland's President, his wife and numerous other top civilian and army personnel had died in Saturday's crash. <br/><br/>Mr Kaczynski and his wife are to be given a state funeral in the city of Krakow on Sunday. <br/><br/>World leaders, including US President Barack Obama are likely to attend the funeral. <br/>