] Afghanistan's historic presidential election closed on ] Saturday without any of the feared large-scale violence, ] but the vote was thrown into turmoil when most candidates ] said a flawed process made the poll invalid. ] ] All 15 of President Hamid Karzai's rivals said they were ] withdrawing from the election because systems to prevent ] illegal multiple voting had gone awry. The move ] effectively left Karzai as the only candidate in the ] fray. Election in Afghanistan questionable |