The remains of Polish President Lech Kaczynski, his wife and other victims of a 2010 plane crash will be exhumed to help investigators determine the cause of the crash that killed 96 people, a spokesman for top prosecutors said today. Prosecutor Maciej Kujawski told The Associated Press that investigators are in talks with Polish and foreign experts who they want to carry out the exhumations at an unspecified time. Temperatures in Poland allow for exhumations to take place from mid-October until mid-April. Kujawski said the autopsy documents that Poland received from Russia, where the crash occurred, are incomplete and in some cases erroneous and don’t help explain the reason for the crash, which is under a renewed investigation in Poland. Doubts raised by the documents have led to nine exhumations in previous years. In six cases the bodies were found to have been mixed up. The bodies arrived from Russia in sealed coffins and no examinations took place in Poland. Kaczynski’s plane crashed April 10, 2010, in dense fog on approach to Smolensk airport. Separate commissions of aviation experts in Poland and in Russia blamed the crash on insufficient training of the crew and on human error in adverse circumstances.