ISLAMABAD: The plot to assassinate Pakistan's former prime minister Benazir Bhutto was hatched at the official residence of an army brigadier, according to a report published on Friday in The Express Tribune newspaper.The latest inquiry into the December 27, 2007 attack on an election rally that killed Bhutto, conducted by the home ministry, reveals the involvement of nine people, one of them a brigadier, described as a key architect. The report is said to be in the possession of interior minister Rehman Malik and has only been shown to President Asif Ali Zardari , Bhutto's widower.Malik described the report as "concocted and false".The inquiry, the third such investigation, was completed under the supervision of Rehman Malik, who has been working on it for three years after quietly securing permission of Zardari.The revelation by the fresh probe could embarrass the country's powerful military establishment. Soon after Bhutto's death, the former chief of Pakistani Taliban Baitullah Mehsud was singled out through some flimsy phone recordings as the mastermind behind the attack. Mehsud, who was killed in a suspected US missile attack in August 2009, had denied his involvement in the attack during which Bhutto was shot at before a suicide bomber blew himself up.The report said Zardari had intentionally kept the latest probe a secret, aiming to first take the army leadership into confidence before ordering the arrest of the brigadier mentioned.It said five of the nine plotters were still alive and that they were the ones who hired the killers and gave them shelter and logistical support. These five men will now formally be charged and put on trial. The remaining four perpetrators died while carrying out the assassination.It further states that logistical support and rehearsals for the murder were organized by uniformed persons. Militant groups, close to the military establishment, provided the foot soldiers.