It is thought that by August 2004 more than a million people in Darfur, Sudan had been displaced from their homes by the fighting and about 188 000 had fled to Chad. In February 2003 the emergence of two anti-government rebel groups (the Sudan Liberation Army and the Justice and Equality Movement) led to pro-government reprisals by the Janjaweed militia and units of the Sudanese army. Guesses about the number of people killed reached …