Bhutto was killed on Dec 27, 2007 when a suicide bomber exploded himself close to her car in Rawalpindi while campaigning for the Pakistan People's Party (PPP) in parliamentary and provincial elections.
The inquiry of Commission set up in 2009 to ascertain the facts and circumstances of Bhutto's death concluded that the death could have been prevented.
The UN report on Bhutto's death found that presence of Pakistan's intelligence agency ISI deliberately prevented investigations into the death of Bhutto and may have been behind decisions like preventing an autopsy and hosing down the crime scene.
Pakistan Foreign Minister, Shah Mehmood Qureshi send one letter to UN Secretary General on Jun 23, 2010, where he took objection to the repeated but unevidenced finger-pointing at the role of Pakistani security agencies and establishment.
The letter stated that "Comments and observations about the Pakistan Army, Inter-Services Intelligence (ISI) or the so-called Establishment, are only the opinions of the members of the Commission."
Farhan Haq, Associate Spokesperson for the UN secretary general told "We're working on the reply," in response to a question about Ban's reaction to the letter written by Qureshi.