President Macron was last night facing calls to impose a state of emergency after marauding gangs of rioters - some armed with stolen rifles - clashed with police in a fourth night of mayhem. Thousands of looters ransacked some of France's major cities as local police declared they were now at 'war' with 'savage hordes of vermin' - with officers from two of the country's biggest policing unions now threatening to revolt. Britain's Foreign Office issued an alert to tourists thinking of travelling to France, as the violence continued to deepen following the fatal shooting of 17-year-old Nahel Merzouk who...