Prime Minister Theresa May said the threat level was lowered following "significant" amount of police action over the last 24 hours as part of the investigation into the Manchester bombing that killed 22 people.
Chelsea cancels a victory parade while both UEFA and Formula One each announce a minute's silence.
The fatalities include children. Police say the assault at an Ariana Grande concert in the English city was carried out by a single suicide bomber, whose name they believe they know. Daesh claimed responsibility.
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