In September 2006, CBS produced an interview with Musharraf. In this interview, Musharraf claims that after the 9/11 attacks, then-Deputy Secretary of State Richard Armitage threatened Pakistan's military intelligence chief that the U.S. would bomb his country 'back to the Stone Age' if Musharraf didn't cooperate with the USA. (Bush and Musharraf: Friends Again - TIME)
In 2006, Musharraf wrote a book in which he stated that Omar Sheikh, one of the primary financers of the 9/11 attacks, may have worked for British intelligence during the 1990s. (xymphora: Omar Sheikh and British intelligence)
So, who killed Bhutto?
"Former Pakistani Prime Minister Benazir Bhutto, 54, was shot at and killed by at least two snipers before a suicide bomb attack on the periphery of her carcade.
"Police confirmed that the snipers fired five bullets from AK-47 assault rifles. Two of the bullets hit Benazir in the neck, while a third hit her forehead." - reports
"Remember the concept of ‘triangulation’ from the “JFK” movie. Some reports ... are claiming multiple snipers firing at Bhutto, and multiple snipers also attacked a Nawaz Sharif rally. This appears to be standard American military procedure for a can’t-fail assassination, and is what the Pentagon (probably) used against JFK." - Xymphora permanent link
(Benazir Bhutto was no fan of the USA as she believed that the USA may have killed her father. - Kissinger Threatened Zulfiqar Ali Bhutto: That threat and his ...)
So, a CIA organised assassination of Bhutto could be meant to lead to riots leading to the Pakistan army's decision to replace Musharraf with a more pro-American general.