Eircom Internet services were seriously disrupted again last night due to another suspected cyber attack.

Many of the company's 500,000 subscribers suffered Internet outages or delays after what the firm says was an "unusual and irregular volume of traffic".

The situation reoccurred yesterday, but services were restored last night and technical experts are now working to determine the source of the problem.

The outages are likely to have been caused by a deliberate attack on the Eircom network by computer hackers.