The Port of Tyne has confirmed that no-one has been injured in the fire at the site in South Shields.
Around 50 firefighters are at the scene.
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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.