Police, however, have spoken only of “an improvised device” used in the attack.
ISIS says “a soldier of the caliphate planted bombs in the middle of Crusaders gatherings” then detonated them.
According to Fox News, ISIS did not say whether the attacker was killed.
The group claimed that “30 Crusaders were killed and 70 others were wounded,” higher than the totals confirmed by authorities in Manchester.
Several explosions have rocked Manchester Arena, in northern England, at the end of American Ariana Grande gig Monday night.
The number of casualties is yet unknown, but multiple reports said several people died while many were injured. It was not clear whether the blasts were the handiwork of terrorists.
Video footage showed people fleeing in tears from the venue after bangs rang out immediately after the concert finished.
Bloodied concertgoers were pictured being helped by emergency services outside the gig and armed police were seen patrolling the arena.
Children were also reported to be among the dead following the deadly explosion.
