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Page last updated at 09:26 GMT, Tuesday, 16 February 2010

Is there a perfect crime?

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The biggest diamond heist in history occurred on Valentine's Day seven years ago. Thieves broke into a secure vault in Antwerp, the world's diamond capital, without tripping a single alarm or injuring any guards.

Greg Campbell, co-author of Flawless, a new book about the robbery, and Dick Kirby, a retired detective sergeant in the Flying Squad, reflect on the idea of a "perfect crime".

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