United Nations experts have called for an investigation into Guatemalan Attorney General Consuelo Porras for her alleged involvement in illegal adoptions of a number of indigenous children, which she denies.

The group of experts says that scores of indigenous children from the same children's home were reportedly put up for illegal adoption abroad during Guatemala's civil war.

In a statement, they say that Porras served as the home's director - and as the legal guardian of the children there at the time - for seven months in 1982.

Porras has categorically rejected the allegations that she was involved in any wrongdoing as false, adding that they "were being used for political purposes".

According to the experts, who are independent of the UN but appointed by it to advise on human rights matters, the allegations are "gravely concerning".