WASHINGTON (Reuters) - An international organization representing police chiefs has broadened its policy for the use of deadly force by telling officers to shoot suspected suicide bombers in the head, The Washington Post reported on Thursday.The International Association of Chiefs of Police issued new guidelines to its 20,000 members about two weeks before British police shot dead a Brazilian electrician because they mistook him for a suicide bomber, the newspaper said.U.S. law enforcement officers typically had been authorized previously to use deadly force if lives were in imminent danger, the newspaper said.Jean Charles de Menezes, 27, was shot repeatedly in...