[Ward:] Welcome back. I'm Clarissa Ward, in London. Ariana Grande just took to the stage at the "One Love Concert" in Manchester, England. It is an all-star concert for the victims of a suicide bombing in that city less than two weeks ago, 22 people were killed. The performers refused to be silenced by the latest act of terror here in the U.K. Despite yesterday's attack in London, the show goes on right now with heightened security though, of course. And now we're hoping to have joining us CNN International Correspondent Phil Block who is there at the concert. Phil, the crowds are just staggering. Tell me what is the mood of the crowd?
[Black:] Staggering, they were loud. I thought they were loud and then Ariana Grande came on stage. We're going to pan the camera and show you a little of what we could see at the moment. Ariana Grande is on stage right now. She just finished a huge rendition with the Black Eyed Peas. And if there in no miss-hit "Where is the Love?" If there was a roof it would have came off. It was really so extraordinary to see. This crowd is enjoying this so much. The atmosphere, it is warm, it is loud, they are singing, they are dancing as one. As I said, it is just an absolutely extraordinary event to witness, really. And from the atmosphere, the mood here, you could not really think that this is a community, a city that was torn apart by terrorism just two weeks ago. And remember, a good part of this crowd were actually at Ariana Grande's concert in the Manchester Arena two weeks ago just before that terror attack. Many of them ran for fears as they heard the explosion that took place outside. Today, this is a gesture that says we're not going to be we're not going to take any of that too seriously. We're not going to worry about that. These people, some 50,000 of them, have been waiting outside for hours. They've come here under very strict security. They've all been searched individually. They haven't allowed this to ruin their mood in any way, shape, or form. And they are having a truly phenomenal time. Ariana Grande hasn't done much talking. It's all been about the singing. She hasn't explained why she thought it was important to come back. She left that to her manager who came on the stage and said that Ariana had called him after the terror attack and said that if we don't do anything, I don't think I could live with myself. And so, this is the result. This extraordinary event pulled together at very short notice. One that the organizers say was initially all about the attack in Manchester, but now it means so much more after last night's attack in London as well. Clarissa, back to you.
[Ward:] And, Phil, I mean an extraordinary event and also an extraordinary responsibility, though, for security services. Give us a sense of the, you know, the protocol or procedures that they're taking to make sure that this all goes off safely.
[Black:] Indeed. That is one that the Manchester police seem to have embraced wholeheartedly. They are in full support. There's the ones that have provided all the security in the streets surrounding this area while also maintaining a very heightened level of security and visibility across Manchester as a whole. Across this city, so many things appear to have gone back to normal. But for the security presence, the police presence, you still see it everywhere. Today, they have help make this happen. They acknowledged that it was something of a controversial decision to do this so soon, but not all the victims of the attack supported the idea. For some it was just too soon to come together in this way. But the majority of the victims are said to have supported it. And so, the decision was made to proceed. The crowd and the community has gotten behind it entirely. And so, that's why you've seen this huge gathering of people come together and what can only really be described as a truly joyous event so soon after such a terrible period of suffering and trauma for the people of this city, Clarissa?
[Ward:] Phil Black, just awesome to see those crowds in Manchester. Thank you so much. Well, still to come, Donald Trump sparking a backlash among U.K. leaders after criticizing London's mayor in the aftermath of the terror attacks. What he said and how they're responding, next.