The U.N. says that a peacekeeper in Sudan's state of East Darfur was shot dead and two others were injured Friday in an attack by unidentified gunmen.

The United Nations says it is working with Sudan's government to investigate the attack on the peacekeeping team's site near Muhajeria in East Darfur State.

The UNAMID African Union/U.N. peacekeeping force was established in 2007 to protect civilians in Darfur, but also contributes to security for those providing humanitarian aid, verifying agreements, political reconciliation efforts and promoting human rights.

It has about 16,500 troops and military observers and over 5,000 international police. More than 300,000 people have been killed in the Darfur conflict since rebels took up arms against the Sudanese government nearly 10 years ago, accusing it of discrimination and neglect.