A pair of suicide bombers were apparently behind last week’s bloody attack on opposition leader Benazir Bhutto, a top intelligence official said Tuesday, as the prime minister expressed optimism that the people behind the plot would soon be brought to justice. Police had initially said only one suicide bomber participated in the attack, but the official, speaking on condition of anonymity because he was not authorized to speak to the media, said two severed heads found at the scene — and the fact that no families had emerged to claim either one — suggested two men were responsible. Full Story