NEW DELHI (Agencies) - UN Secretary-General Ban Ki-moon has said that the world body is in process of setting up a fact-finding mission to probe the assassination of former prime minister Benazir Bhutto. "We are discussing about the modalities, scope and financing of this commission. But we still need some more time to finalise all the details," said the UN Chief while replying to a question during a press conference here on Friday. Ban Ki-moon said he had discussed this matter with President Asif Ali Zardari during their meeting in New York last month. "Basically, we stand ready to provide necessary assistance," Ban added. Ruling out withdrawal of its observer missions from Pakistan and India on Line of Control, UN Secretary General said composite dialogue process should continue between the two countries to maintain peace in South Asia. Replying to a question about UN Military Observer Group in India and Pakistan, Ban Ki-moon said he has made fresh appointments to the mission and expressed the hope that it will continue to carry out its mandated activities successfully. "India and Pakistan are two important countries in the subcontinent and they should continue to improve their relations through dialogue and cooperation," he said. The world body also expressed concern over the security situation in Pakistan and sought international cooperation to help the country create secure atmosphere and have socio-economic development. The UN Secretary General said during his meetings with President Asif Ali Zardari and Prime Minister Manmohan Singh on the margins of UN General Assembly last month, he was encouraged by the commitment made by leaders of both countries to peace process. He hoped that the existing peace process would continue for improving bilateral relations. "I am encouraged by the commitment made by leaders of both countries," he said, hoping that the existing peace process would continue. Referring to the recent opening of trade routes on Line of Control, he said it was an "encouraging development". UN Secretary General also urged rebels Democratic Republic of Congo to "disengage" from the conflict and maintain a ceasefire as they close in on the key city of Goma. Only 850 United Nations peacekeepers stand between eastern Goma city and the rebel troops led by Laurent Nkunda after government soldiers fled the province on Wednesday. "I also urge General Nkunda to disengage and keep this ceasefire declaration he has made and engage in dialogue," Ban told reporters. The UN chief described the situation as "very frightening" and urged African leaders to take "concrete measures" to defuse the crisis. UN forces' commander Colonel Samba Tall has said the ceasefire was holding, and said his MONUC force was respecting its mandate, under which it could engage the rebels if necessary to protect civilians. But Ban said there were "limits" on the role of the UN troops. "The United Nations is not a party of any belligerent. We cannot be seen as such." The UN chief said the world body needed a Security Council mandate to send more troops and said he hoped the European Union will be able to agree on deploying troops.