A man from Hale has been arrested in connection with the murder of Diana Lee at her home in Byley Lane,Cranage, on Thursday 9th August. The 47 year old man, who was known to the victim, is currently being questioned by police.
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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.