More than 200,000 Titanic-related records have gone online to mark the 100th anniversary of the ship's sinking. A letter writtten by the ships bandleader to his parents in Colne in Lancashire will be auctioned later this month.
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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.