UNITED NATIONS UN Secretary-General Ban Ki-moon has said in a letter to the Security Council President that the three-member international commission he was establishing to look into the assassination of Benazir Bhutto was mandated to fact-finding, and not to carrying out a criminal investigation. "You will note that the commission's mandate would be of a limited duration (a maximum of six months), and would not extend to carrying out a criminal investigation," he said in the letter to the 15-member council president for February, Ambassador Yukio Takasu of Japan. "The duty of determining criminal responsibility of the perpetrators of the assassination would remain with the Pakistani authorities," the letter, which was issued as a document of the Security Council on Thursday, said. "It's mandate would be to determine the facts and circumstances of the assassination of former Prime Minister of Pakistan, Mohtarma Benazir Bhutto," the secretary-general added. The names of the commission member have not yet been announced. The secretary-general's spokesperson, Michele Montas, said it would be done soon. But, according to U.N. sources, the commission will be headed by Chile's U.N. Ambassador Heraldo Muoz. The council president has told the secretary-general that the 15-nation body has taken note of his intention to appoint the commission "with appreciation", the spokesperson said. "The international commission would enjoy the full cooperation of the Pakistani authorities and be accorded the privileges, immunities and facilities necessary for the independent conduct of the inquiry, including, in particular, unhindered access to all relevant sources of information," Ban said. "The international commission may request cooperation of a third state in the collection of materials or information relevant to the case. I count on the full cooperation of Member States with such a request". The commission, he said, would be staffed in a manner to enable it to carry out its duties effectively. "The specific details of the logistical, financial, security and human resources reqauirements of the commssion would be determined based on the results of a small security and technical mission that would be dispatched to Pakistan and other places, as necessary, in light of the Secvurity Council's support for the establishment of the commission. "The international commission would be funded by voluntary contributions from Member States. Pakistan has offered to provide 'seed money' to an appropriate United Nations trust fund to help an early deployment of the security and technical assessment missions. The Secretariat is engaged in discussions with Pakistani authorities as to the size and nature of a Pakistani contribution, mindful of the importance of maintaining the independence and impartiality of the commission."