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US singer Ariana Grande’s concert, packed with 21,000 fans and their parents, was struck by a suicide bomber at 10.35pm on Monday, killing and maiming children.

Islamic State terrorists have not officially claimed responsibility - but it has now emerged jihadi cheerleaders were tweeting about the arena four hours before the detonation.

Police revealed a lone male attacker detonated an improvised explosive device (IED) in the foyer as children and their guardians left, singing and enjoying themselves.

Unconfirmed reports suggest the device was packed with nails.

Police, intelligence experts and analysts have scrambled to build a picture of the attacker’s movements over the last months.

It is not yet clear if he had accomplices.

But, groups linked with (ISIS) have now claimed the attacker’s atrocities will be followed up by others.