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Jun 13 14 10:36 AM

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For almost half an hour, 13 aircraft vanished from air traffic controllers' radar screens as they flew at high altitude above Europe, it has been revealed.
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The "undprecedented" disappearances happened on 5 June and 10 June, hitting control rooms in Austria and neighbouring countries.The relevant EU agencies have been asked to investigate, Austria's flight safety organisation said on Thursday. Marcus Pohanka of Austro Control said the height, location, identities and other information for a total of 13 aircraft suddenly vanished

http://www.independent.co.uk/news/world/europe/unprecedented-disappearance-of-aircraft-from-radar-screens-in-europe-9534776.html