Assistant Chief Constable, Jim Campbell urges any member of the public with information about the shooting on Friday to contact Northumbria Police on 101 or through Crimestoppers.
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The threat level has been raised to critical by MI5's Counter-Terrorism Analysis Centre.
Prime Minister Theresa May announced the decision from Downing Street.
Newcastle Central Mosque is welcoming Muslims and non-Muslims alike this evening to stand in solidarity with the people of Manchester.