The United Nations refugee agency says four armed men attacked one of its field offices in Darfur, shooting a guard in the leg.

Spokeswoman Jennifer Pagonis says no one else was hurt in the attack. It occurred late Monday in Habila, in western Darfur.

She says the men stole communications equipment before leaving.

It is unclear whether the attackers belonged to any of the rebel groups or government-backed militias active in the western Sudanese region.

Violence still plagues Darfur despite a recent peace agreement between the Sudanese government and Darfur rebel groups.

Some rebels have refused to sign the accord. It is designed to end more than three years of fighting that has killed more than 180,000 people.

Some information for this report was provided by AFP and Reuters.