Former Brazilian President Michel Temer has been arrested as part of a wide-ranging corruption investigation, local media say.
Local media say police had been trying to trace Mr Temer, who left office on 1 January, since Wednesday.
The former president has consistently denied any wrongdoing.
Dozens of politicians and business executives have been convicted or are being charged as part of the Operation Car Wash.
Mr Temer took over the Brazilian presidency in August 2016 following the impeachment of Dilma Rousseff, and was replaced in January by Jair Bolsonaro.