[IMG]http://d.yimg.com/a/p/afp/20100417/capt.p***o_1271470449016-1-0.jpg?x=130&y=88&q=85&sig=UCr9QrSLQsfcWIix9j8_pw--[/IMG]AFP - Hundreds of thousands of mourners were expected Saturday at a memorial for victims of Poland's air crash tragedy, as a volcanic cloud threatened to keep world leaders from the president's funeral.




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