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A woman lays flowers at the scene of the knife attack in Russell Square in London, on Thursday, August 4.
A woman lays flowers at the scene of the knife attack in Russell Square in London, on Thursday, August 4.

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    Mayor: London one of the safest capitals in the world

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Mayor: London one of the safest capitals in the world

London Mayor Sadiq Khan calls for calm in his city after an apparent mentally-deranged man kills one and injures five others with a knife. CNN's Michael Holmes reports.

Mayor: London one of the safest capitals in the world

London Mayor Sadiq Khan calls for calm in his city after an apparent mentally-deranged man kills one and injures five others with a knife. CNN's Michael Holmes reports.