Story highlights Six children have accused foreign troops of sexual abuse

The head of U.N. peacekeepers in the country was fired over sex abuse allegations

(CNN) For the second time in six months, there are allegations of sexual abuse against foreign soldiers in the Central African Republic.

The reported cases took place in 2014 but came to light only in recent weeks.

The alleged abuse involved six children: five girls and a boy who were between the ages of 7 and 16 at the time it is said to have taken place.

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The soldiers are believed to be from Georgia, France and the European Union.

"These are extremely serious accusations and it is crucial that these cases are thoroughly and urgently investigated," Zeid Ra'ad Al Hussein, the U.N. high commissioner for human rights, said Friday.

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