The Belgian public broadcaster RTBF said on Monday that prosecutors are investigating whether Belgian banks paid out interest and dividends on Libyan accounts frozen under UN sanctions in 2011.

Reuters reported RTBF as saying that up to 5 billion euros ($5.7 billion) could have been disbursed to people controlling Libyan accounts, including militia groups in the country accused of human rights abuses.

"RTBF said that when the United Nations agreed to freeze deposits held by Muamar Gaddafi’s administration abroad, Belgium had done so but had not halted payments of interest and dividends." The report adds.

10 out of 16 billion euros disappeared from the Libyan frozen assets in Belgium, Le Vif - a Belgian paper revealed last March - adding that those assets were controlled by the inner circle of Gaddafi.

Libyan assets are frozen since 2011 by a UNSC resolution 1973.