People hold up signs which say 'Turn to Love for Manchester' during a vigil for the victims of yesterday's Manchester Arena terror attack in Trafalgar Square on May 23, 2017 in London, England. 22 people, including children were killed and 59 injured in an explosion during a concert at Manchester Arena last night. Greater Manchester Police are treating the incident as a terror attack and say the attacker died in the explosion.  (Photo by Jay Shaw Baker/NurPhoto via Getty Images)