All three Gardaí are suspended from duty.
A Garda superintendent and a ranked Garda arrested in connection with an investigation into alleged links between members of the force and a criminal gang have been released without charge on Friday morning.
The two members of the force had their periods of detention extended and were questioned overnight.
A Garda inspector who was also detained as part of the same investigation was released last night.
A file on the case will be sent to the Director of Public Prosecutions.
All three Gardaí have been suspended from duty.
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