Pebbles decorated with the Manchester bee, a symbol of Manchester, are photographed at the base of a 'tree of hope' planted as a memorial following the Manchester Arena bombing in central Manchester on May 22, 2018, the one year anniversary of the deadly attack. - Prime Minister Theresa May and Prince William will on May 22, 2018 join families of the victims of the Manchester Arena bombing at a commemoration ceremony in the city on the first anniversary of the tragedy. They will attend the service at Manchester Cathedral alongside first responders, civic leaders and some of the scores injured in the suicide attack on May 22 last year, which killed 22 people. Salman Abedi, a British man of Libyan heritage, blew himself up outside the venue, which had been hosting a concert by teen pop idol Ariana Grande. (Photo by Paul ELLIS / AFP) (Photo credit should read PAUL ELLIS/AFP/Getty Images)
