The Metropolitan Police has said it will use "every power, tactic and tool" to protect London against "one of the worst spates of violent disorder in the last decade". It follows more than a week of violence in some towns and cities across England and Northern Ireland. More than 100 people were arrested in central London last week after officers clashed with demonstrators in Whitehall. Deputy Assistant Commissioner Andy Valentine said the force would "not hesitate to arrest hundreds more" people if further violent disorder took place. "The scenes of racist, thuggish and criminal behaviour across the country have been...