UNITED NATIONS, May 25 (AFP) - A panel investigating the United Nations' role during the 1994 Rwanda genocide is to begin work "immediately" and have its report ready in about six months, a UN spokesman said Tuesday. The three-member inquiry is headed by former Swedish prime minister Ingvar Carlsson and includes former South Korean foreign minister Han Sung-Joo and Nigerian General Rufus Kupolati, spokesman Manoel Almeida e Silva said. The nomination of Carlsson, 64, was announced on May 7 by UN Secretary General Kofi Annan. Between April and July 1994 some 800,000 minority Tutsis and moderate Hutus were murdered in the tiny, landlocked Central African nation. The inquiry's mission is to "establish the facts and draw conclusions as to the response of the organization to the tragedy." Families of the victims have criticized the United Nations for being aware of preparations for the genocide and doing nothing to stop it. The inquiry is also to investigate the role of Annan, who headed the UN's peacekeeping operations at the time. Annan has blamed the UN Security Council for inaction. The group will have access to internal UN documents and telegrams sent to UN headquarters during the period before the three-month civil war. Annan obtained Security Council support for the inquiry in March, after he agreed in January to demands for an independent investigation. Two parliamentary commissions -- in Belgium in 1997 and France in 1998 -- cited the UN for its management of the crisis.  