JUBA: A UN cargo helicopter crashed Tuesday in South Sudan's warzone region of Unity state, the UN peacekeeping mission said, adding that three of its crew had perished in the crash.
The UN mission said it had "dispatched a search and rescue team" to the area, near the northern oil town of Bentiu, one of the hardest fought over areas in the country's more than eight-month-long civil war.
UNMISS confirms one of its MI-8 helicopters on routine cargo flight has crashed abt 10km south of #Bentiu, #Unity State.
— UNMISS (@unmissmedia) August 26, 2014
UNMISS deeply concerned about fate of crew, has dispatched a search & rescue team to site of incident.
— UNMISS (@unmissmedia) August 26, 2014
The Mi-8 helicopter, which generally carries between three and five crew members, crashed about 10 kilometres (six miles) south of Bentiu.
"The mission lost contact with the helicopter, which was on a routine cargo flight from Wau to Bentiu," around 1130 GMT, the United Nations mission in South Sudan (UNMISS) said in a statement.
"Investigations regarding the cause of the incident will begin as soon as possible."
The area has seen recent heavy battles between government and rebel forces, with the town of Bentiu badly damaged in the months of fighting.
There was no indication given as to what had caused the crash.
Rebel spokesperson Lul Ruai Koang, speaking in Ethiopia, refused to comment if the helicopter may have been shot down.
"At present the cause of the crash is unknown and we have asked our commanders in the field to update us," Koang told AFP.
There have been previous crashes. Last year a UN helicopter crash landed on its way from South Sudan to Ethiopia, injuring four crew members.
In 2012, South Sudan gunmen shot down a UN helicopter, killing all four Russian crew onboard.
UN cargo helicopters are vital to supplying peacekeeping bases across the impoverished nation, as well as providing food aid for civilians, with aid agencies warning of the risk of famine should fighting continue.
Thousands of people have been killed and more than 1.8 million have fled civil war sparked by a power struggle between President Salva Kiir and his sacked deputy Riek Machar.
Over 40,000 civilians are sheltering in the UN camp in Bentiu alone, some of the almost 100,000 civilians in UN bases who fled there to escape killings and massacres.
Rebel forces in Unity are led by warlord Peter Gadet, who has been slapped with sanctions by both the United States and European Union for atrocities.
Gadet on Saturday seized a UN helicopter that landed near Bentiu carrying ceasefire monitors.
One ceasefire monitor died during the incident and the others were released.
On Monday, warring leaders signed their fourth ceasefire deal after regional mediators threatened sanctions should the agreement fail once again.
The United Nations warns that 50,000 children face death from malnutrition, while half the country's population need urgent food aid.
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