Police escort members of the public from the Manchester Arena after an explosion occurred at the venue Monday night after singer Ariana Grande had performed.
At least 22 people, including children, were killed in the deadliest terror attack on British soil since the 2005 London bombings.
Saffie Rose Roussos, 8, and Georgina Callander, 18, have been named as the first victims killed.
ISIS claimed responsibility for the attack but offered no evidence to support their claim.
Police said they believed a man carrying explosives acted as a lone attacker and died in the blast, and that they are now trying to determine if he may have been part of a wider network. A 23-year-old man was arrested Tuesday in south Manchester in connection with the bombing.
Speaking after an emergency Cabinet meeting on Tuesday, British Prime Minister Theresa May condemned the attack as "callous" and "cowardly." U.S. officials later named Salman Abedi as the suspect in the suicide bombing, according to The Associated Press and Sky News.
The Park Inn gave Ariana Grande attendees refuge after Monday's explosion at Manchester Arena.
A man embraces a woman and a teenager as he collects them from the Park Inn Hotel where they were given refuge after Monday night's explosion at the Manchester Arena.
Earlier police had warned people to stay away from Manchester Arena after reports of two loud explosions. The crowd was made up of mainly younger people who had come to see Grande in her first of three scheduled concerts in the UK, on her European and Latin American tour.
Social media posts from the scene showed panicked concert goers running down the arena's stairs in an attempt to get away.
Dashcam video highlighting where the explosion occurred in relation to the arena.