UNITED NATIONS — In the latest in a series of sexual abuse allegations against United Nations peacekeepers in the Central African Republic, the families of two women and one girl under the age of 18 have accused three peacekeepers of rape, the United Nations announced Wednesday.

The families came forward on Aug. 12, the same day that the United Nations secretary general, Ban Ki-moon, ousted his mission chief in the Central African Republic over numerous sexual abuse claims. It is unclear when the three alleged attacks took place.

The United Nations does not typically name the country whose troops are accused, and its officials did not in this latest case. But a United Nations spokeswoman, Vannina Maestracci, said the families said that the rapes took place in Bambari, a market town besieged by fighting between rival armed groups. The United Nations peacekeepers serving in that town are from the Democratic Republic of Congo, a country whose troops have a long history of sexual violence in its own internal conflicts.

United Nations leaders have had to contend with repeated allegations of sexual abuse and exploitation in peacekeeping in recent months, especially in the Central African Republic. The peacekeeping mission there, established less than a year ago, has been accused of at least 13 instances of sexual abuse.