BRITAIN-ATTACKS-ANNIVERSARY

A picture shows Britain's Prince William, Duke of Cambridge's (L) and Britain's Prime Minister Theresa May's (R) personal messages of support attached to a 'tree of hope', a memorial set up for the Manchester Arena bombing, after leaving The Manchester Arena National Service of Commemoration at Manchester Cathedral in central Manchester on May 22, 2018, on the one year anniversary of the deadly attack at the Manchester Arena. - 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 / POOL / AFP) (Photo credit should read PAUL ELLIS/AFP via Getty Images)