He banned booze on the tube, now Boris Johnson is forcing binge drinkers to wear electronic tags.
London's mayor is launching a pilot scheme to fit drunken offenders with tags which detect alcohol in sweat.
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Pictures of today's events unfolding following a major security incident at the Houses of Parliament.
At least two people have died after a knifeman brought terror to the heart of Westminster.
The Cobra committee brings together government ministers with senior officials of the emergency services and security agencies.