Three members of the Olympic Council of Ireland (OCI) have had their passports seized by police in Rio as part of an investigation into illegal ticket touting.
The Irish Times reports that officers raided the officials' hotel rooms and took mobile phones, computers and tickets in the early hours of the morning.
The men, named by police sources as Kevin Kilty, Dermot Henihan and Stephen Martin, will have to remain in Rio until Tuesday for questioning.
It comes after the arrest and detention of Patrick Hickey - head of the European Olympic Committee and an International Olympic Committee (IOC) member - along with Kevin Mallon of hospitality firm THG Sports, which has also been implicated in the case.
Police are investigating an alleged scheme to pass OCI tickets to THG via the OCI's official ticket vendor Pro10, in a bid to get around Rio organisers' decision to reject THG's application to be the official vendor.
Mr Hickey, Pro10 and THG have all denied any wrongdoing.
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The International Olympic Committee (IOC) member arrested in Brazil over suspected illegal ticket sales is sharing a jail cell with an executive from the sports hospitality company also implicated in the case, prison bosses said.
Authorities said Patrick Hickey had been given a cell with Kevin Mallon of hospitality firm THG Sports.
The men have been given the same treatment as other inmates at the maximum-security Bangu complex, officials added - including a standard haircut and prison fare.
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Thiago Braz da Silva has won the pole vault final - giving Brazil its first athletics gold medal of the Rio Olympic Games.
A Brazilian policeman, who was working security at the Rio Olympics, has died after being shot in the head when he and two other officers got lost near a slum and came under fire.
Helio Vieira died late on Thursday after the truck he and his fellow officers were travelling in was sprayed with bullets which shattered the windows.
They had been using a GPS device to navigate unfamiliar streets on Wednesday afternoon when they took a wrong turn off a highway leading to Rio's international airport.
Justice Minister Alexandre de Moraes announced Mr Vieira's death on his official Facebook page. The other officers suffered minor injuries.
More than 85,000 security forces have been deployed in Rio for the Olympics, which is double the number of London in 2012.
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Bomb specialists in Brazil have detonated an unattended backpack that was found near the finishing line of the men's cycling race in Rio de Janeiro.
Officials believe that the bag may have belonged to a homeless man, but security protocols say that any unattended objects must be destroyed.
In recent days, there have been several incidents of unattended bags being detonated out in Rio, as the city is on high alert around the Games.