Gardai are questioning a man in connection with an on-going fraud investigation at Dublin's passport office.
A man and a woman - both in their 30's - were arrested after internal checks revealed irregularities in the processing of three passports.
The woman has since been released and a file will be prepared for the DPP.
The arrests followed an investigation which was launched by the Passport Service last Autumn after the discovery of the irregularities.
