Authorities believe the younger brother of Salman Abedi, Hashem played a major role in planning the suicide bombing, the deadliest in a string of attacks in London and Manchester in 2017.
US rapper Nicki Minaj said that she was pulling out of a planned concert in Saudi Arabia next week, citing her support for the rights of women and the LGBTQ community.
Adele said she had "even considered miming", but she said she could never do this to her fans. Earlier this week, the singer hinted she might retire from touring.
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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