Nigeria, Feb. 14 -- Boss Mustapha, a former Secretary to the Government of the Federation (SGF), said on Tuesday that former President Muhammadu Buhari's signature was forged to give approval to a cash withdrawal of $6.2 million from the vault of the Central Bank of Nigeria (CBN).

A former controller at the CBN in Abuja, Onyeka Ogbu, had on Monday told the court that he received the written approval given by then President Buhari, Mr Mustapha, and Mr Emefiele for the cash payment.

Mr Mustapha testified in the ongoing prosecution of Godwin Emefiele, the CBN governor at the time of the controversial payment, before the Federal Capital Territory (FCT) High Court in Abuja on Tuesday.

Mr Emefiele, the immediate-past governor of the CBN, is ...