Gardai investigating computer hacking, which led to the Fine Gael website crashing, were last night questioning two men.
The students were detained yesterday following inquiries by officers from the Garda Computer Crime Investigation unit, as part of an international operation involving the FBI and other police agencies.
The Fine Gael site was alleged to have been targeted by the 'Anonymous' group, which has claimed responsibility for a series of attacks on companies that objected to the whistleblowing site Wikileaks.
Detectives from the unit, which is part of the National Fraud Bureau, arrested an 18-year-old student after raiding a house in Birr, Co Offaly, yesterday morning.
Officers also detained a 19-year-old man in the Claregalway area of Co Galway.
The two were taken to Tullamore and Galway garda stations for questioning about alleged criminal damage.
The garda investigation was launched in January after the Fine Gael website was broken into and access was gained to the contact details of 2,000 subscribers.
Among the details accessed by the hackers were telephone numbers of subscribers. Gardai also found chemicals and equipment, which could be used in the manufacture of ecstasy, at the rear of the house in Birr.