A group of what appears to be armed officers were pictured in Yoden Way, Peterlee, after the alarm was raised.
Durham Police have confirmed that they were called at 12.10pm on Monday, March 20, following the reports that the man was threatening to harm himself at a property in the town.
A spokesman for the force said just before 4pm: “The incident remains ongoing.”
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We will bring you further updates as we receive them.