“Four of the girls said their abusers were attached to contingents operating as part of the European Union operation,” Zeid Ra'ad Al Hussein said, adding that he was “extremely alarmed at continuing allegations.”
Last year, allegations of sex abuse were levelled at soldiers serving with French and UN missions in the country.
“Two of the girls interviewed said they were raped by EUFOR soldiers, and the two other girls said they were paid to have sexual relationships with other EUFOR soldiers,” a statement said.
“While the nationalities of some of the soldiers remain unclear, three of the girls said they believed their abusers were members of the Georgian EUFOR contingent.
The four girls were aged between 14 and 16 at the time of the alleged abuse.”
Reacting to the allegations, EUFOR said in a statement “the EU takes these allegations very seriously”.
But the “responsibility for any investigation, disciplinary or criminal action remains in the hands of the contributing States,” EUFOR added.
Zeid said UN human rights staff also interviewed two children who were allegedly abused in 2014 by soldiers from the French Sangaris force deployed to try contain a wave of brutal sectarian violence.
Fourteen soldiers from the French force are under investigation in France over allegations they forced children to perform sexual acts in exchange for food.
The girl and boy interviewed by the UN in the cases linked to the French were aged seven and nine respectively at the time of the alleged attacks.
“The girl said she had performed oral sex on French soldiers in exchange for a bottle of water and a sachet of cookies.
Both she and the nine-year-old boy said that other children were abused in a similar fashion in repeated incidents involving several French soldiers,” the statement said.