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"They were internal investigations and I am not surprised that the politicians and security services have examined their work in secret and subsequently found themselves not to blame.
The silence, at 1200 BST on Friday, is part of a day of events to commemorate the attacks and remember the victims.
The day will end with a public ceremony at Regent's Park in west London at 1800 BST, when the names of the 52 people who died will be read out.