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Kenya: Two named suspects were known to security agency

5 October 2013 Last updated at 22:25 BST

At least two of the named suspects in the Nairobi mall attack were known by Kenyan officials, according to one security expert.

The BBC's Gabriel Gatehouse spoke to security expert George Musamali who said: "Two names come out very prominently because they were known to the security forces for quite some time - so why they were still in circulation is something that puzzles us because they were wanted for quite a while now."