KHARTOUM, April 13 (Xinhua) -- The United Nations-African Mission in Darfur (UNAMID) said on Tuesday that four peacekeepers of the United Nations-African Mission in Darfur (UNAMID) are missing since Monday evening in the restive western Sudanese region of Darfur.

"The peacekeepers last movement was reported at 16:00 (1100 GMT) on April 11, 2010, as they departed their team site just outside of Nyala, South Darfur, on a 7 km journey back to their private accommodation," the peacekeeping mission said in a statement issued in Khartoum.

"There have been no sightings of our staff and we are deeply concerned for their well-being," said UNAMID Joint Special Representative Ibrahim Gambari, who has held direct contacts with Sudanese government officials over this issue.

UNAMID has mobilized its resources in the region and is working closely with the government of the Sudan and local authorities in the search for the missing peacekeepers, according to the statement.

The 26,000-strong UNAMID have been the target of several attacks where more than 20 soldiers were killed since the African Union United Nation operation took over from the African mission on Dec. 31, 2007.

The incident occurred while a five day polling is taking place in the troubled region like the other parts of the country.