Fred Plankan News Today

Russian investigators are look at human error as the possible cause of a plane crash that has poland in mourning. the countrys president was killed, along with dozens of top government and military leaders. cnns fred plankan is in warsaw with the latest. >> reporter: as investigators piece together just what happened to polands presidential plane, pols are trying to come to terms with how a single disaster could wipe out such a large number of the countrys elite. >> translator: we can see that c...