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At the International Jewellery Fair, all the people present had fax machines, metal detectors, armored vehicles and a transcript.
But the thief still managed to escape with 500 diamonds worth more than $1. 5 million. (£600,000)
One of Australia\'s biggest diamond theft cases
Police believe the bag was stolen either on the way to the Australian jewellery fair in downtown Sydney or there.
Gary fitz Roy, the organizer of the event, said he was confused about how thieves managed to escape the apparently tense security measures.
\"Our security procedures at the fair are recognized throughout the world as one of the most stringent and best procedures,\" Mr Fitroy said . \".
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