Police officers leave the home of Andy Coulson, the former communications director of Britain's Prime Minister David Cameron, in south London July 8, 2011. Police arrested Cameron's former spokesman on Friday over the scandal that has shut down Rupert Murdoch's News of the World, forcing the prime minister to defend his judgment while promising sweeping new rules for the British press. REUTERS/Paul Hackett (BRITAIN - Tags: POLITICS CRIME LAW)