The Olympic chief arrested over ticket scalping allegations has been transferred to a prison.
Irish International Olympic Committee executive Patrick Hickey was denied bail after his legal team argued unsuccessfully that he was being detained illegally following his early-morning arrest at his hotel.
Police began questioning the 71-year-old the following day after he was hospitalised with chest pains.
Hickey has now been transferred to the sprawling Bangu prison complex in Rio, a police statement said.
He has temporarily stepped aside from his IOC duties, including his post on the ruling executive board and heading the influential umbrella group for Europe's Olympic bodies.