Kenya has made a formal protest against a UN report which alleged that its personnel serving in a Security Council-authorised mission in Haiti had been involved in sexual abuse.

In a letter to the UN chief António Gutteres, Kenya's Foreign Minister Musalia Mudavadi expressed concern over the allegations that were first reported last August.

A report by the secretary general made public last week implicates officers under the Kenyan-led mission in four cases of rape and other forms of sexual violence. Three of the alleged victims are children - a 12-year-old and two aged 16.

Mudavadi said the claims were promptly investigated through an inquiry and found to be unsubstantiated.

"No formal complaints were filed with any authority, and findings were shared transparently with both Haitian and UN bodies," he said.