The A6076 is closed due to an accident between the A692 Gateshead Road (Potters Wheel Traffic Lights) and Pearson Street. Diversion via Burnopfield.
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Northumbria Police says armed patrols will continue across the region following the terror attack at Westminster.
Heroin users in Stockton are being told to be "mindful" of harmful drugs being sold in the area after a sixth death linked to the drug.
A boxing coach from Birtley was among those first on the scene when PC Keith Palmer was stabbed during a terror attack in Westminster.