UNITED NATIONS-The members of an independent commission tasked with looking into the facts and circumstances surrounding the December 2007 assassination of former Prime Minister Benazir Bhutto will arrive in New York next week to start their work, a UN spokesman said on Wednesday. 'The six-month mandate of the Bhutto Commission of Inquiry has formally begun on Wednesday, spokesman Farhan Haq told The Nation in response to a question. He said that the three members of the commission will spend a week or so at UN Headquarters in New York holding consultations and studying relevant documents ahead of their departure for Pakistan. The commission is led by Chiles UN Ambassador Heraldo Munoz, a dissident during the dictatorship of General Augusto Pinochet who heads the UN Peace-building Commission. The other members are former Indonesian Attorney General Marzuki Darusman, who is now a member of the National Commission of Human Rights, and Irelands former Deputy Police Commissioner Peter Fitzgerald, who has served the UN in a number of capacities including heading the initial mission of inquiry into the assassination of former Lebanese Prime Minister Rafik Hariri in 2005. Under terms agreed to by the UN and the Pakistani govt, the commissions mandate will be 'to inquire into the facts and circumstances of her death, according to the official statement made last week. 'The duty of determining criminal responsibility of the perpetrators of the assassination remains with the Pakistani authorities, it said. The commission, which is expected to leave for Islamabad in the middle of July, will submit its report to the Secretary-General Ban Ki-moon within six months of the start of its work. Ban will share the report with the Pakistani govt and submit it to the Security Council for information. According to informed sources, Pakistans Interior Ministry, which will be the focal point for the commission, has been asked to provide English translations of the Urdu documents of the investigation conducted so far. The FIR and the reports of local investigation agency are in Urdu. The sources said the commission is also expected to work on a list of witnesses to be called for interviews during their stay in Pakistan. A six-member UN technical team for the commission has already paid a week-long trip to Pakistan to prepare the ground for the UN probe. The team was headed by Mark Quarterman, who had also worked on the Hariri Commission. The Pakistani govt had requested the United Nations to establish a commission to investigate Benazir Bhuttos killing. It has already paid 1.8 million dollars to the UN as seed money to cover its initial costs, and more countries are likely to contribute. Benazir Bhutto was assassinated in gunshot and suicide bombing attacks on Dec. 27, 2007 after addressing an election rally at Liaquat Bagh in Rawalpindi.