By January 2011 the United Nations High Commissioner for Refugees (UNHCR) estimated that there are 262,900 Sudanese refugees in Chad. The majority of them left Sudan escaping from the violence of the ongoing Darfur crisis, which began in 2003. UNHCR has given the Sudanese refugees shelter in 12 different camps situated along the Chad–Sudan border. The most pressing issues UNHCR has to deal with in the refugee camps in Chad are related to insecurity in the camps, (where children are being forcibly recruited by Chadian and Sudanese armed groups), malnutrition, access to water, HIV and AIDS, and education.