The Office of the Special Prosecutor (OSP) says it provided investigative and evidentiary support to the United States Federal Bureau of Investigation (FBI), contributing to the conviction of former Tema Oil Refinery (TOR) Managing Director, Asante Kwaku Berko, in a US bribery case.
The OSP said the assistance was provided through Ghana’s established mutual legal assistance framework and was acknowledged by the United States Department of Justice (DoJ) as having made a significant contribution to the prosecution.
“The involvement of the OSP has been acknowledged by the United States Department of Justice (DoJ) as providing ‘significant assistance to this prosecution,’” the OSP said in a public notice issued on Monday, August 10, 2026.
A federal jury in Brooklyn, New York, convicted Berko on August 6, 2026, after finding him guilty of conspiring to pay and paying more than US$1 million in bribes to several Ghanaian officials between 2014 and 2015.
The alleged bribery scheme was linked to the development and financing of a power plant in Ghana under an agreement between the Government of Ghana and Turkish energy company Aksa Enerji Uretim A.S., a client of US-based investment bank Goldman Sachs.
According to the OSP, much of its collaboration with the FBI took place behind the scenes, with Ghanaian authorities providing investigative and evidentiary support as US authorities pursued the case.
The OSP said the outcome demonstrates the importance of international cooperation in investigating and prosecuting cross-border corruption cases.
It added that the case also highlights the role of mutual legal assistance arrangements in allowing law enforcement agencies across jurisdictions to share information and evidence in corruption investigations.
Berko, who holds both Ghanaian and US citizenship, faces a maximum prison sentence of 30 years following his conviction.
He is scheduled to appear before the US court on November 10, 2026, for sentencing.
