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Baghdad Violence Leaves at Least 52 Dead BAGHDAD, Iraq - A suicide car bomber slammed into a line of police cars sealing off a Baghdad neighborhood Friday as American troops rounded up dozens of suspected militants, including many foreign fighters, capping a day of violence across Iraq that left at least 52 dead.    The car bombing, which killed three people and wounded 23, was the second this week targeting the capital's beleaguered police forces... 