ISLAMABAD/WASHINGTON (Reuters) - In 2003 or 2004, Pakistani intelligence agents trailed a suspected militant courier to a house in the picturesque hill town of Abbottabad in northern Pakistan.
There, the agents determined that the courier would make contact with one of the world's most wanted men, Abu Faraj al-Libbi, who had succeeded Sept. 11 mastermind Khalid Sheik Muhammad as al Qaeda operations chief a few months earlier. Agents from Pakistan's powerful and mysterious Inter-Services Intelligence agency, known as the ISI, raided a house but failed to find al-Libbi, a senior Pakistani intelligence official told Reuters this week.