Latest: All gas customers in Galway and Mayo have had their supply restored

Update - 8.26pm: Gas supply has been fully restored to customers in Galway and Mayo.

A full investigation is now underway into how gas entered the system on Friday without the safety odour.

Gas Networks Ireland has apologised to customers and thanked them for their patience.

Update - 5.03pm: Gas customers in Tuam, Headford, Westport, Claremorris, Crossmolina and Ballinrobe are now safe to resume using their natural gas supply.

Gas Networks Ireland have just issued their latest update - apologising again for any inconvenience caused over the past few days.

They say the gas supply for customers in Castlebar and Ballina is also expected to be restored later this evening.

Earlier: Technical teams are working to restore gas supply to the remaining areas affected by this week's fault at the Corrib Gas Refinery.

An error allowed gas to enter supplies, without the odour which is normally added for safety reasons.

Around 10,000 homes in Galway and Mayo were affected.

"Last night, we were able to check and make sure that there were no pockets of unodourised gas in the Galway/Salthill/Oronmore and Claregalway areas and we'll also bring customers back on there," said Gas Networks Ireland safety manager Owen Wilson.

"And what we'll be doing over the weekend now is working our way north."

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