The Office of the Special Prosecutor (OSP) has disclosed that it provided investigative and evidentiary assistance to the United States Federal Bureau of Investigation (FBI) in the case that led to the conviction of former Tema Oil Refinery (TOR) Managing Director, Asante Kwaku Berko.
The OSP said its support was provided through Ghana’s mutual legal assistance arrangements and contributed significantly to the prosecution of the former TOR boss in the United States.
In a public notice issued on Monday, August 10, 2026, the OSP said the United States Department of Justice (DoJ) had recognised Ghana’s contribution to the case.
“The involvement of the OSP has been acknowledged by the United States Department of Justice (DoJ) as providing ‘significant assistance to this prosecution,’” the office stated.
A federal jury in Brooklyn, New York, found Berko guilty on August 6, 2026, after determining that he was involved in a scheme to pay more than US$1 million in bribes to several Ghanaian officials between 2014 and 2015.
The case was linked to the development and financing of a power plant in Ghana under an agreement between the Ghanaian government and Turkish energy company Aksa Enerji Uretim A.S., which had US-based investment bank Goldman Sachs as a client.
According to the OSP, much of its cooperation with the FBI was conducted without public attention, with Ghanaian authorities assisting US investigators with relevant evidence and investigative information.
The anti-corruption agency said the case demonstrates the importance of cooperation between countries in tackling corruption that crosses national borders.
It explained that mutual legal assistance frameworks enable law enforcement and investigative bodies in different jurisdictions to exchange information and evidence needed to pursue complex corruption cases.
The OSP said the successful prosecution also reinforces the need for stronger international collaboration in investigating financial crimes involving multiple countries.
Berko, who is a dual citizen of Ghana and the United States, could face up to 30 years in prison following his conviction.
He is expected to return to the US court on November 10, 2026, for sentencing.
