UN Secretary-General Ban Ki-moon was "shocked to the core" by the allegations that emerged after a UN team traveled to south-central Kemo prefecture to interview the women and girls.
"We must face the fact that a number of troops sent to protect people instead acted with hearts of darkness," UN spokesman Stephane Dujarric said yesterday.
UN rights officers have so far interviewed 108 alleged victims, "the vast majority" of whom are under-age girls who were raped, sexually abused or exploited by foreign troops, he said.
AIDS-Free World, a civil society group that tracks peacekeeper sex abuse cases, said three girls told a UN rights officer that in 2014 they were tied up and undressed by a Sangaris commander inside a camp and forced to have sex with a dog.
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Dujarric stressed that "the facts have not been ascertained" in what could be the most serious wave of allegations to date to hit the troubled peace mission in the Central African Republic.
France's UN Ambassador Francois Delattre and US Ambassador Samantha Power both called the allegations "sickening."
France sent its Sangaris intervention force to the Central African Republic in December 2013 and while the troops are not part of the UN mission, they have been mandated by the Security Council to help restore peace to the country.
After the UN Security Council held a closed-door meeting on the latest allegations, US Deputy Ambassador David Pressman said they appeared to show that the abuse was "widespread and systematic."
Describing the claims as "extremely concerning", Pressman said they should be met with a "swift, full and urgent response."