“According to the American intelligence analyst, a field source in Pakistan had passed word through a Pakistani military officer that bin Laden was in the northwest town of Peshawar. The warning was given on August 4, 1999. For reasons still unclear, U.S. intelligence only received notification on August 7, by which time bin Laden was safely back in Afghanistan. A follow-up investigation confirmed that bin Laden had indeed been in Pakistan for at least two days, but a subsequent internal investigation at the CIA to determine how it could take three days to receive such a tip proved inconclusive.”
– Gerald Posner, Why America Slept, Page 155