Ariana Grande's Manchester concert will go ahead "loudly" and "with greater purpose" after Saturday's terror attack in London.
In a statement released on Sunday, Grande and Justin Bieber's manager Scooter Braun said the tribute concert will be to "honour those lost" in both the Manchester and London's attack.
"After the events last night in London, and those in Manchester just two weeks ago, we feel a sense of responsibility to honour those lost, injured, and affected," he said.
"We plan to honour them with courage, bravery, and defiance in the face of fear," he added.
"Today's One Love Manchester benefit concert will not only continue, but will do so with greater purpose."
Sunday night's show will raise money for the We Love Manchester Emergency Fund, and will feature A-list acts such as Coldplay, Katy Perry, Usher, Take That and Miley Cyrus.
"We must not be afraid and in tribute to all those affected here and around the world, we will bring our voices together and sing loudly," Braun said.
The manager said artists "have the full support of Greater Manchester Police and the government and are assured the safety of all those attending is the highest priority".
Greater Manchester Police chief constable Garry Shewan also issued a statement following Saturday's attack, which left 7 dead and many injured.
"We're deeply saddened to hear about last night's horrific attacks in London and our thoughts are with everyone affected," he said.
"There are two large-scale events taking place in Greater Manchester today and we would like to assure people that these will still take place, but with additional security in place to ensure the safety of everyone," he added.
Shewan guaranteed fans will see "a significant number of officers from both GMP and colleagues from other forces, some of which will be armed".
There will also be "additional security checks taking place and everyone will be searched".
Greater Manchester Police is asking attendees "not to bring bags if they can", in order to speed up entry.
Grande was one of many stars tweeting messages of support for victims of the London attack, writing: "Praying for London".
Supermodel Cara Delevingne also wrote a statement, reminding Londonders to "stay safe" and "not let this break us".
The attack came less than two weeks after the harrowing attack at an Ariana Grande concert at the Manchester Arena on 22 May, which saw 22 people killed and 116 injured.
(c) Sky News 2017