In early 2003 a new rebellion of Sudan Liberation Movement/Army (SLM/A) and Justice and Equality Movement (JEM) groups in the western region of Darfur began. The rebels accused the central government of neglecting the Darfur region, although there is uncertainty regarding the objectives of the rebels and whether they merely seek an improved position for Darfur within Sudan or outright secession. Both the government and the rebels have been accused of atrocities in this war, although most of the blame has fallen on Arab militias (Janjaweed) allied with the government. The rebels have alleged that these militias have been engaging in ethnic cleansing in Darfur, and the fighting has displaced hundreds of thousands of people, many of them seeking refuge in neighbouring Chad. There are various estimates on the number of human casualties, ranging from under twenty thousand to several hundred thousand dead, from either direct combat or starvation and disease inflicted by the conflict.