Source:
The GuardianCrucial surveillance photographs clearly identifying two of the 7 July bombers more than a year before the atrocity were cropped by intelligence officials in such a "speedy" manner as to render them unrecognisable to a key supergrass.
The inquests into the 52 victims of the attacks heard from a top MI5 officer that in April 2004 a photo that originally had Mohammad Sidique Khan and Shehzad Tanweer in it was shown to the informant Mohammed Junaid Babar, described as "one of the most significant sources the intelligence services had at that time". The pair were returning from meeting a known bomb plotter.
But instead of the original colour photograph, in which both men are clearly identifiable, an intelligence officer edited the photo to render Tanweer unrecognisable and crop out Khan altogether, and forwarded it to the US where Babar was in custody.
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http://www.guardian.co.uk/uk/2011/feb/21/mi5-cropped-7-7-bombings