Crowds stand on Oldham street during civil disturbances in Manchester, England, Tuesday, Aug. 9, 2011. Britain began flooding London's streets with 16,000 police officers Tuesday, nearly tripling their presence as the nation feared its worst rioting in a generation would stretch into a fourth night. The violence has turned buildings into burnt out carcasses, triggered massive looting and spread to other U.K. cities. (AP Photo/Jon Super).