Gardaí have said their investigation into a global computer hacking operation involving Irish individuals and Irish websites is ongoing.

Two Irish men have been charged in their absence with computer hacking offences at a federal court in New York.

Darren Martyn, 25, from Co Galway was charged with two counts of computer hacking conspiracy. Each count carries a maximum prison sentence of ten years.

Donncha O Cearrbhail, 19, of Birr in Co Offaly was charged with one count of computer hacking conspiracy, which carries a maximum prison sentence of ten years.

He was also charged with one count of intentionally disclosing an unlawfully intercepted wire communication, which carries a maximum sentence of five years in prison.

Mr O Cearrbhail was arrested in Dublin yesterday for questioning in relation to the global investigation, but was released without charge this morning.

A file on the matter has been sent to the Director of Public Prosecutions.

The investigation into global computer hacking was instigated by the FBI and the case is being prosecuted by the US Attorney's Office for the Southern District of New York.

As part of the investigation a total of five people were charged - the two Irish men, two others from the UK and an American man.

A second American, 28-year-old Hector Xavier Monsegur from New York, has pleaded guilty to 12 counts of computer hacking offences.

The FBI investigation centres on a series of cyber attacks that include the hacking of the Fine Gael website and those of Sony Pictures and Fox Broadcasting.