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RAF officers authorisation to interrogate Nazi suspects.
Paper Trail...Sqn Ldr frank McKenna's meticulous investigation is revealed in the fascinating dossier.
Remarkable top secret documents relating to the investigation into the murder of 50 prisoners of war who took part in the Great Escape have come to light.
The papers made up a dossier put together by the RAF Special Investigation Branch which had the job of finding the German killers of the Allied airmen who took part in the high-profile escape.
The documents, that include custody mugshot photos and fingerprints of Gestapo suspects, have been put up for sale through Bosley's Auctioneers.