GENEVA (AFP) - Asian and Western members of the UN Human Rights Council failed to find a common voice on the situation in Sri Lanka before they were due to hold a special session on the issue Tuesday. Switzerland, with the support of about 30 mainly Western states, has tabled a draft resolution calling on Colombo to investigate all allegations of human rights abuses during Asias longest-running civil war between the Sri Lanka army and the rebel Tamil Tigers. It also called on the Sri Lankan government to ensure the freedom of displaced people and access to drinking water and sanitation. However, another draft text tabled by countries including China, India, Pakistan and Sri Lanka commends Colombos actions in dealing with internally displaced people, and encouraged UN agencies to continue cooperating with the Sri Lankan government. Sri Lankas allies did not mention any possible probe. The 47-state Human Rights Council, which was formed in 2006 to react more quickly to emergency situations, is meeting more than two months after UN human rights chief Navi Pillay spoke about possible war crimes and crimes against humanity committed by both sides. On Saturday, United Nations Secretary General Ban Ki-moon asked Sri Lanka to probe violations allegedly committed during the governments defeat of the rebel group and pressed for unhindered access to 300,000 displaced people in government-run camps. Although the European-led text targeted violations during the conflict and backed investigations, the watchdog group UN Watch dismissed it as a joke. Despite the call by UN rights officials for an international inquiry into possible war crimes, the proposal instead asks Sri Lanka to investigate itself its a joke, said UN Watchs executive director Hillel Neuer. The text deliberately omits any condemnation of the government for its actions, and actually praises its 'cooperation, he added. Advocacy group Human Rights Watch said that the Council needed to examine the creation of an impartial commission of inquiry to investigate allegations of human rights violations committed by both parties as a matter of urgency. Human Rights Watch received many credible reports of violations of the laws of war by both the LTTE (Tamil Tigers) and Sri Lankan government forces during the recent fighting. This includes the LTTEs use of civilians as human shields and child soldiers, and the Sri Lankan governments indiscriminate shelling of densely populated areas, including hospitals. These allegations demand an impartial investigation, it said in a statement. Diplomats were meanwhile scrambling to find a consensus on the two texts. If a compromise is not found, Sri Lankas draft resolution would be submitted for adoption by the Council since it was tabled before the Swiss version. Some 80,000 to 100,000 people were killed in nearly three decades of civil war in Sri Lanka, according to a UN estimate.