Three Olympic Council of Ireland officials, including one from Northern Ireland, have had their passports, phones and laptops seized by Brazilian police.
It is part of the investigation into alleged illegal ticket sales.
According to RTÉ and the Irish Times, the officials include OCI Chief Executive Stephen Martin, who is from Bangor, County Down.
Mr Martin was previously a director of coaching at Ulster Hockey.
The two other executives are reported to be Dermot Henihan and Kevin Kilty.
No arrests were made during the search on Sunday.
Brazilian police are seeking to acquire the passports of three other people connected to the OCI.
RTÉ says the development is part of an ongoing investigation and there is nothing to suggest impropriety on the part of any of those involved.
A statement released by the OCI said: “Early this morning in Rio, Brazilian police arrived at the OCI offices in the Olympic village and at OCI accommodation outside of the village.
“The OCI personnel were asked to present for questioning at a local police station on Tuesday. They agreed to do so.
“The OCI had an allocation of unused official tickets in their offices which had been made available for athletes’ families and friends. The police also took possession of these tickets.”
Former Olympic Council of Ireland (OCI) president Patrick Hickey was arrested in connection with the alleged illegal sales on Wednesday.
He is being held alongside THG director Kevin Mallon at Rio’s Bangu 10 prison.
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