Incredible footage has emerged of the moment Pat Hickey opened the hotel room door to Brazilian police before his arrest.
The video released on ESPN Brazil shows Hickey then leaving the room with police.
Hickey was arrested on suspicion of involvement in the irregular selling of tickets on the black market in Rio, Brazilian Police have said.
Video Credit: André Linares, Gabriela Moreira and ESPN Brazil.
It is understood Mr Hickey was arrested in a hotel in the Barra da Tijuca neighbourhood. Irish consular officials in Brazil are aware of Mr Hickey's arrest.
At the daily briefing in Rio, International Olympic Committee director of communications Mark Adams told reporters: "Like the rest of you we're still trying to establish the facts this morning and find out exactly what happened.
"I can confirm that Mr Hickey was taken to hospital this morning.
"I believe the police have had a press conference this morning and confirmed there was a search warrant and an arrest warrant.
"Needless to say, we'll be fully co-operating with any police investigation should there be one.