Stockton High Street was closed by emergency services after a suspected gas leak on Friday.
Around half a dozen police vehicles blocked traffic from getting onto the main street, at around 7.30pm.
A spokesman at the station said that gas engineers remained on site at 10pm and that the brigade had attended as a precaution.
He explained that engineers had tracked the leak to underneath the pavement, and the ares covered by a cordon was reduced while they got to work. Fire crews stayed on scene for around an hour.
People out on the High Street were asked to leave the scene, and traffic was diverted.
Bus company Arriva said it’s service 7a and 15 services were affected, but later released a statement at around 9pm saying all its services were running as normal.
A Northern Gas Networks spokeswoman said: “Engineers from Northern Gas Networks were called to an area of Stockton town centre this evening after reports of a gas escape at a building in John Walker Square.
“Nearby roads were closed by police and have since reopened. Our engineers remain on site carrying out safety checks.
“Anyone that smells gas or suspects carbon monoxide should call the National Gas Emergency Service immediately on 0800 111 999. This line is in operation 24-hours a day, seven days a week.”
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