Ramon Olorunwa Abbas aka Ray Hushpuppi accused of multimillion-dollar fraud and money laundering by the United States was kidnapped by the FBI from Dubai, his lawyer says.
Hushpuppi and another cyber-heist suspect Olalekan Jacob Ponle (aka Mr Woodberry) were arrested in Dubai, where they lived, in June a appeared in a Chicago court on 3 July.
The United Arab Emirates has no extradition treaty with the United States but Dubai police said they had been extradited to the US.
A spokesman for the US Department of Justice told the BBC that Hushpuppi was expelled from Dubai and was not extradited. He did not answer how he ended up in US custody.