Durham Constabulary have launched a major armed response operation following reports of a robbery in which a firearm is reported to have been discharged.
The incident is ongoing in Yarm Road Darlington.
Yarm Road is closed and the police helicopter is above.
It is believed that the incident is happening at a supermarket on Yarm Road following an armed robbery.
The Northern Echo and social media reports suggested that an armed robbery had occurred on Yarm Road, in which a fire arm was discharged.
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