On January 20 the Security Council established the United Nations commission for India and Pakistan (UNCIP), to which it assigned responsibilities of investigation, good offices, and mediation. The UNCIP members, representing five states, arrived in the area in July 1948, and the next month proposed a cease-fire and detailed arrangements for a truce and the holding of a plebiscite. Because of disagreements between India and Pakistan over details, the cease-fire did not come into effect until January 1, 1949, and the final delineation of the cease-fire line was not established until nearly seven months later. During this interval a United Nations Military Observer Group in India and Pakistan (UNMOGIP) was set up to observe and report on the cease-fire, and U.S. Admiral Chester Nimitz was nominated as plebiscite administrator.