Unofficial action by a number of Bus Éireann drivers in Limerick city is causing major disruption to services in the county.
A statement from the company said: "Bus Éireann very much regrets and is deeply concerned by the impact of this action on customers including short notice delays and major service cancellations.
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"Bus Éireann has since the issue arose yesterday been urging the use of recognised and agreed dispute resolution mechanisms and continues to make these available."