A fan group, Newcastle United Supporters Trust, says it's concerned about apparent club plans to sell the lease for a plot of land beside St James' Park. It claims development on the area, near the gallowgate end of the stadium, would restrict the future potential to expand the ground.
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He was told he was being let go by the Magpies in May.
A joint bid could see Hartlepool, Middlesbrough, Stockton, Redcar and Cleveland, Darlington the region become a cultural capital.
Witnesses say they were told to stay in their homes after the incident last night.