"Eleven people were killed and about 10 others taken to hospital" after an unknown number of gunmen began shooting in the camp for internally displaced people in Ngakobo, 300 kilometres northeast of the capital Bangui, a statement said.
"Those responsible for these dreadful acts" have not been identified, the communique, in French, said.
MINUSCA, which has around 12,000 peacekeepers and police on the ground, "immediately took measures to reinforce its position around the displaced camp and to step up its patrols", it said.
The fighters then attacked a camp for displaced people as well as NGO offices. UN troops from Burundi and Pakistan hit back to protect civilians, killing 12 of the assailants.
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The week before a dozen people died in the capital in fighting between Muslim forces and Christian vigilantes
CAR plunged into chaos after the March 2013 ousting of long-serving president Francois Bozize, a Christian, by the mainly Muslim Seleka rebel alliance -- triggering revenge attacks and a spiral of atrocities in which thousands were slaughtered.
After two years of bloodshed, however, CAR had appeared to be returning to normal, holding peaceful elections early this year following a visit by the pope.
But despite the presence of thousands of UN peacekeepers and a few hundred remaining French troops, tensions remain high and tens of thousands of people are still displaced and in need of aid.
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