More than 30 mobile phones were found during a search operation at Portlaoise Prison today.
The Irish Prison Service said the search began at about 7am in the prison's E Block, which is where "subversive prisoners" are held.
As well as the 37 mobile phones, a number of modems and USB keys were also been found.
It said the search was “intelligence led” and was led by the Operational Support Group, a group of specially-trained prison officers.
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“For operational and security reasons no further comment will be made at this stage,” a spokesman for the Irish Prison Service said.