( CNN ) -- The United Nations has sent police and military patrols to a camp in western Sudan after reports fighting there killed civilians , a U.N. spokesman said Tuesday . A file photo of refugees queuing for food in the Kalma camp in western Sudan . Aid groups have started evacuating wounded from the Kalma camp , home to 80,000 internally displaced people in the Darfur region of western Sudan . The U.N. said it received reports that Sudanese police vehicles surrounded the camp and that civilians were killed Monday during subsequent attacks inside the camp . The U.N. African Union Mission in Darfur `` is extremely concerned by this serious incident [ and the ] circumstances will be investigated , '' the mission said in a statement . `` It is closely monitoring the situation and [ calls ] on all parties to exercise restraint . '' A spokesman for the mission , Noureddine Nezni , said Tuesday the Dutch wing of Medecins Sans Frontieres had evacuated 47 wounded people who were being treated at a nearby hospital . Some of them -- mostly young men -- refused to be evacuated for fear of being arrested for having participated in the fighting , Nezni said . Nezni would not say how many people were killed in the Monday attacks . `` There are many figures being thrown around and we hesitate to give any numbers before we are sure , '' he said . `` We are still checking and hopefully we will have the correct figure late today . '' The Sudanese government said it entered the camp to look for `` huge quantities of arms and criminals , '' Nezni said . The U.N. African Union Mission in Darfur said it sent police and military patrols to Kalma to confirm the details of the incident and provide assistance . Nezni added that the mission and some aid groups were in talks with refugees at the camp to find a lasting solution to the problems . Fighting has displaced more than two million Sudanese -- and more than 238,000 refugees live in camps across the border in eastern Chad , the U.N. says . They have been displaced by fighting that broke out in 2003 , when rebels began an uprising in Darfur and the government launched a brutal counter-insurgency campaign . The Sudanese authorities armed and cooperated with Arab militias that went from village to village in Darfur , killing , torturing and raping residents there , according to the U.N. , Western governments and human rights organizations . The militias targeted civilian members of tribes from which the rebels draw strength . In the past five years , an estimated 300,000 people have been killed through direct combat , disease , or malnutrition , the U.N. says . Another 2.7 million people have been forced to flee their homes because of fighting among rebels , government forces , and allied Janjaweed militias . The chief prosecutor of the International Criminal Court filed genocide charges against Sudanese President Omar Hassan al-Bashir last month for the campaign of violence in Darfur . CNN 's Eunice Mafundikwa contributed to this report .
United Nations sends police and military patrols to a camp in western Sudan . Move prompted by reports of fighting which killed civilians . 47 wounded people evacuated for treatment at a nearby hospital .