The U.N. peacekeeping mission in Central African Republic says it has launched an investigation into an allegation of child sexual abuse received this week against one of its peacekeepers.

A statement Thursday says the country that contributed the peacekeeper has been asked to investigate as soon as possible.

The U.N. has not announced the country or the age of the female victim.

The spokesman for the U.N. secretary-general told reporters the allegation was made at a health facility run by a partner organization.

The U.N. has been shaken by revelations that a year after staffers first heard children's accounts of sexual abuse by French soldiers, no one has been punished. Ban Ki-moon on Wednesday ordered an external inquiry into how that was handled.