Defense Secretary Leon Panetta's office was notified of the attack 50 minutes after it began, and Panetta learned of it shortly thereafter as he and the military's top general headed to a previously scheduled meeting with President Barack Obama at the White House. Obama, Panetta and Army General Martin Dempsey, the chairman of the Joint Chiefs of Staff, discussed potential responses to the unfolding events in Benghazi during their meeting, which began 78 minutes after the start of the Libya attack, according to the timeline. Panetta and Dempsey then returned to the Pentagon and began a two-hour series of meetings...