It's amazing tale of generosity. More than a dozen people in Lancashire have chopped off their hair for a charity that makes wigs for children who lose their own hair through cancer.
They've done it in memory of Madison Allan who lost her battle with the disease aged just seven. Sarah Rogers has more:
You can find out more at Maddi's Butterflies.
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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.