Prime Minister Theresa May joined Prince William at a memorial service on Tuesday, 22 May, to remember the 22 victims of a suicide bombing at a pop concert in Manchester a year ago, Britain's deadliest attack for 12 years.
His victims included seven children, the youngest aged just eight, while more than 500 were injured.
"Thinking of you all today and every day. I love you with all of me and am sending you all of the light and warmth I have to offer on this challenging day," Grande wrote on Twitter, including a bee emoticon, the symbol of Manchester.
"The targeting of the young and innocent as they enjoyed a care free night out in the Manchester Arena on May 22, 2017, was an act of sickening cowardice," May wrote in an article for the Manchester Evening News newspaper.
"It was designed to strike at the heart of our values and our way of life, in one of our most vibrant cities, with the aim of breaking our resolve and dividing us. It failed."
It echoes a moment when crowds broke into an emotional chorus of "Don't Look Back in Anger" by Manchester rock group Oasis after a minute of silent tribute days after the bombing.
At the exact time the attack occurred, 10.31 p.m., bells will also ring out across Manchester.
Britain is seeking the extradition of Abedi's brother Hashem from Libya over the attack, although the authorities do not believe a wider network was involved.
The Manchester bombing was the deadliest of five attacks in Britain last year blamed on militants which killed a total of 36 people
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