Charles Sirleaf, the son of Liberia’s former President Ellen Johnson Sirleaf, has been arrested in relation to the illegal printing of more than $104m (£78m) worth of local banknotes.
He was a deputy governor of the Central Bank at the time of the incident in March last year. Mr Sirleaf’s former boss – ex-Central Bank head Milton Weeks – has also been detained.
Their lawyers are yet to comment.
The arrests come after a report into the missing millions was released.
The much-anticipated report, carried out by investigative auditing firm Kroll associates, was released by the US embassy on Thursday.
It was looking into the alleged disappearance of more than $100m (£75m) worth of newly printed Liberian banknotes last year.