Over 2.8 million civilians have been displaced and the death toll is estimated at 300,000 killed. Both government forces and militias allied with the government are known to attack not only civilians in Darfur, but also humanitarian workers. Sympathisers of rebel groups are arbitrarily detained, as are foreign journalists, human-rights defenders, student activists and displaced people in and around Khartoum, some of whom face torture. The rebel groups have also been accused in a report issued by the U.S. government of attacking humanitarian workers and of killing innocent civilians. According to UNICEF, in 2008, there were as many as 6,000 child soldiers in Darfur.