The A19 southbound is closed - queueing traffic due to police incident between the A1290 and the A1231 Wessington Way. Congestion to the A184 Newcastle Road.
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The band played a hit-packed set including Everyday I Love You Less and Less, Ruby and I Predict a Riot.
The police force say events taking place over the bank holiday weekend will still see an increased police presence.
Stockton Stages takes place from Thursday, July 20 to Saturday, July 22 in Stockton town centre.