The prosecutor of the International Criminal Court on Monday said her office would appeal the acquittal of former Côte d'Ivoire President Laurent Gbagbo.

The court acquitted Gbagbo on crimes against humanity charges on Jan. 15, saying prosecutors had failed to prove any case against him. He was then conditionally released from detention after more than 7 years in custody.

Prosecutor Fatou Bensouda said on Monday she would ask appeals judges to reverse the acquittal and declare a mistrial, resetting Gbagbo’s legal process.

“The appeal will demonstrate that the trial chamber committed legal and procedural errors which led to the acquittals of Mr. Gbagbo and Mr. Blé Goudé on all counts.” Prosecutor Fatou Bensouda’s office said.

Gbagbo is the first head of state to stand trial in The Hague. The 73-year-old was released in February under conditions including that he would return to court for any prosecution appeal against his acquittal.

His deputy, Charles Blé Goudé, is living in the Netherlands under similar conditions.