Around 250-300 ppl walk from AJ Bell Stadium to Barton Moss protest camp for the 3rd anti-fracking march since Dec. http://t.co/SzJZ9cLa0k
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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.
In her message Theresa May praised the "inspirational bravery" and "unbreakable spirit" of Mancunians in the wake of the blast.