Up to 3,000 homes and businesses are without power in the Longford and Roscommon area after a large electricity supply fault.

Shops and businesses have closed early for the day in several towns across the region as a result.

The fault, which occured at a "medium voltage substation", initially affected 7,000 customers.

ESB Networks crews are working to repair the fault but the electricity provider says supply may not be returned until later this evening.