Unite the Union has announced that cleaning staff at Manchester Airport will hold a second 2h hour strike. Union members are walking out from 6 am tomorrow in a row with a contractor over pay and conditions.
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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.