Since Sudan has experienced civil war for many years, many non-governmental organisations (NGOs) are also involved in humanitarian efforts to help internally displaced people. The NGOs are working in every corner of Sudan, especially in the southern part and western parts. During the civil war, international nongovernmental organisations such as the Red Cross were operating mostly in the south but based in the capital Khartoum. The attention of NGOs shifted shortly after the war broke out in the western part of Sudan known as Darfur. The most visible organisation in South Sudan is the Operation Lifeline Sudan (OLS) consortium. Some international trade organisations categorise Sudan as part of the Greater Horn of Africa