The former boss of Anglo Irish Bank has been arrested on an extradition warrant, the US Attorney's Office in Massachusetts says.
David Drumm will now remain in custody in Boston until his hearing in federal court on Tuesday.
He moved to the US in 2009, the same year Anglo Irish collapsed and was bailed out by Irish taxpayers.
Mr Drumm, who ran Anglo Irish Bank from 2005 to 2008, subsequently filed for bankruptcy in the US.
However, the bankruptcy bid failed and a Boston court ruled that he could be held liable for debts of 10.5m euro