At least 22 people, including children, have been killed and 59 injured in a suicide bombing at a crowded pop concert in Manchester, United Kingdom.

The attack is considered the most deadly in Britain in a decade and flags are at half mast.

Police say attacker died after detonating ‘Improvised Explosive Device’ in foyer of concert hall.

Police believe he is the only person involved.

The horror occurred at about 10.30 p.m. on Monday at the end of a concert by the American singer Ariana Grande, whose music is popular with children and teenagers.

The attack, which took place in the foyer area of the arena, left hundreds of people scampering for safety, with young people at the concert separated from their parents in the chaos.

Families have continued to look for their missing children, with some of them going on social media to announce their missing family members. 

Medics had rallied to the arena, providing help to injured persons. They said wounds are consistent with shrapnel injury.

Investigations are ongoing to determine if there is a network associated with this killer. 

No group has claimed responsibility for the attack.

Police are issuing emergency numbers for people to get information about their missing children or family members.