Reuters news agency has reported that Muammar Gaddafi's widow has challenged a court ruling in Malta to return Bank of Valletta’s $100 million to Libya, even though it was deposited by the late Gaddafi's son, Mutassim.

Safiya Farkash and her lawyers argued in their appeal that the courts of Malta were not competent to hear the case and could not decide the case over the money, the agency reported.

The verdict was issued at the end of June after a legal battle that began in 2012, a year after the overthrow of Gaddafi and his subsequent death.

Several credit cards issued by Bank of Valletta were found in the possession of Mutassim, who was also killed, as the owner of a company registered in Malta.

The original court had upheld the Libyan attorney general's arguments that under Libyan law, al-Mutassim, was an army officer, and was prohibited from taking advantage of any commercial interests.