A total of 12 people have been taken to Altnagelvin hospital as a precaution following a gas leak in the Waterside area of Derry.
The Fire Service and police evacuated a number of buildings on Spencer Road and the street has been sealed off while the scene is examined
It received a 999 call about the smell of gas at around 12.20 pm.
Three tenders from Crescent Link fire station were despatached to the scene.
It is believed an underground cable electrical fire caused carbon monoxide gas to be released, the Fire Service added.
The Ambulance Service was tasked to the scene after a number of people were “experiencing headaches”.
Several business premises including a dental surgery and the Sandwich Company cafe were evacuated.
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