Ex-waiter Mohammed Abu Bakr Mansha, 22, was a childhood pal of the two brothers arrested in the dawn swoop by police two weeks ago.
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Soon afterwards, friends of brothers Abul Kahar, 23, and Abul Koyair, 20, visited him at top-security Belmarsh, South-East London.
And, the Sunday Mirror has learned, that meeting sparked a surveillance operation on the men by the security services. According to a friend of the brothers, they laughed at constantly being followed. Our source said: "It was so obvious we treated it as a joke."
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Mansha - serving six years for possessing an old address of a British Army war hero, which police suspected was part of a terror plot - is appealing against his sentence. His trial revealed him to be educationally subnormal with an IQ of 69 - compared to the average of 100. In the US that would make his court evidence unreliable.
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