Ash from Iceland's erupting volcano has once again disrupted air travel in Europe, forcing flight delays in the UK and Ireland.

By Paul Melia; Patricia McDonagh THE Irish Aviation Authority has said it cannot guarantee holidaymakers will not face further disruption over the summer period because of a fault with Dublin Airport's air-traffic control system.

By ALLISON BRAY PASSENGERS at Dublin Airport can expect ongoing delays for several weeks as engineers continue to work around a computer system glitch responsible for causing last week's radar system meltdown, the Irish Aviation Authority has revealed.

Authorities said they canceled half of the flights going to and from Dublin International Airport Wednesday because of radar system malfunctions.

The Irish Aviation Authority says restrictions have been put in place in the interests of safety, but the radar is now working as normal.The airport is operating at 70% capacity and will do so until 10am at the earliest.The cause of last night's radar failure is still under investigation.