"A UNAMID helicopter, an Mi-8, carrying 18 passengers and three crew on board made an emergency landing approximately 100 metres" (yards) from the helipad at a base belonging to the mission at Saraf Omra in North Darfur, spokesman Ashraf Eissa told AFP.
All on board suffered "varying degrees of injuries as a result of the incident. Eight of them were reported to be seriously injured. No deaths were reported," Eissa said.
Passengers on board the helicopter included both Sudanese and foreign nationals travelling from the North Darfur state capital El Fasher, although no further details were given.
UNAMID said the cause of the accident at 12:30 pm (1500 IST), was unknown and that it was investigating.
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The joint mission first deployed to war-torn Darfur in 2007, four years after mostly black, African insurgents rebelled against the Arab-dominated government in Khartoum, complaining of marginalisation.
UNAMID has more than 17,000 military and police peacekeepers deployed across Darfur.
President Omar al-Bashir is wanted by the International Criminal Court suspected of war crimes, crimes against humanity and genocide in Darfur.