DNA clues to Greek air crash

Authorities verify that blood found in the cockpit of the airliner that crashed in Greece was that of a flight attendant, according to a source close to the investigation. Mystery continues to shroud the final moments of Helios Airways Flight 522 before it crashed, killing all 121 people on board.
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• Watch: Bodies were wearing oxygen masks• Watch: Mystery surrounds crash• Gallery: Crash aftermath• Carbon monoxide ruled out



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