Six years later, Playboy magazine has revealed that the CIA fell victim to an elaborate con by a compulsive gambler who claimed to have developed software that discovered al-Jazeera broadcasts were being used to transmit messages to terrorists buried deep in America.

Dennis Montgomery, 56, the co-owner of a software gaming company in Nevada, who has since been arrested for bouncing $1m worth of cheques, claims his program read messages hidden in barcodes listing international flights to the US, their positions and airports to be targeted.

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