The African Union says armed men have kidnapped two of its peacekeepers in Sudan's Darfur region.

In a statement Monday, A.U. officials called for the immediate return of the soldiers and their vehicle, which they say were taken Sunday night in the town of El Fasher.

In another part of Darfur on Sunday, angry villagers briefly detained eight A.U. troops who had been sent to investigate a deadly attack on a refugee convoy.

At least 30 people were killed in the Saturday ambush by suspected pro-government Janjaweed militia north of El Geneina, in West Darfur.

The A.U. peacekeepers were released unharmed after about 24 hours.

The 7,000 member A.U. peacekeeping force in Darfur has been unable to stop rampant violence and fighting in the region.

Sudan has rejected pressure to replace or expand the A.U. force with U.N. peacekeepers.

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