internal dissent among the rebels led opponents of Garang's leadership, most importantly Riek Machar and Lam Akol, to attempt a coup against him. It failed, and the dissidents split off to form their own SPLA faction, the SPLA-Nasir. On 15 November 1991, Machar's SPLA-Nasir alongside the Nuer White Army carried out the Bor massacre, killing an estimated 2000 Dinka civilians. In September 1992, William Nyuon Bany formed a second rebel faction, and in February 1993, Kerubino Kwanyin Bol formed a third rebel faction. On 5 April 1993, the three dissident rebel factions announced a coalition of their groups called SPLA United at a press conference in Nairobi, Kenya. Sudanese alignments In 1990–91, the Sudanese government supported Saddam Hussein in the Gulf War. This changed American attitudes toward the country. Bill Clinton's administration prohibited American investment in the country and supplied money to neighbouring countries to repel Sudanese incursions. The US also began attempts to "isolate" Sudan and began referring to it as a rogue state. Since 1993, the leaders of Eritrea, Ethiopia, Uganda, and Kenya have pursued a peace initiative for Sudan under the auspices of the Intergovernmental Authority on Development (IGAD), but results have been mixed. Despite that record, the IGAD initiative promulgated the 1994 Declaration of Principles (DOP) that aimed to identify the essential elements necessary to a just and comprehensive peace settlement; i.e., the relationship between religion and the state, power-sharing, wealth-sharing, and the right of self-determination for the south. The Sudanese Government did not sign the DOP until 1997 after major battlefield losses to the SPLA. SPLA alignments In 1995, the opposition in the north united with parties from the south to create a coalition of opposition parties called the National Democratic Alliance. This development opened a northeastern front to the civil war, making it more than before a center-periphery rather than simply a north–south conflict. The SPLA, DUP, and Umma Parties were the key groups forming the NDA, along with several smaller parties and northern ethnic groups. In 1995, Eritrea, Ethiopia and Uganda stepped up their military assistance to the SPLA to the point of sending active troops into Sudan. Eritrean and Ethiopian military involvement weakened when the two countries entered a border conflict in 1998. Uganda's support weakened when it shifted its attention to the conflict in the Democratic Republic of Congo. By 1997, seven groups in the government camp, led by former Garang