Hackers of State sites earlier this year yet to be identified

The head of the Garda Cybercrime Unit, detective superintendent Michael Gubbins, said that Irish authorities had worked with other agencies to solve the attack but they had not found the culprit.
“At the start of the year, our own Government was hit by a DDoS (Distributed Denial of Service) attack. [It was] a group online and we haven’t been able to track them, we worked with our colleagues in Europol, the secret service and the FBI trying to put some investigation into this.