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Ex-MI5 head: 'Regret' 7/7 could not be stopped

Eliza Manningham-Buller, former director-general of MI5, has expressed regret that it was not possible to stop the 7/7 attacks in London.

She was speaking during her second 2011 Reith Lecture, which will be broadcast on 大象传媒 Radio 4 on Tuesday 13 September 2011 at 09:00 BST and repeated on Saturday 17 September at 22:15 BST.

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Duration:

2 minutes