The Islamic State group says one of its members planted bombs in the middle of crowds in Manchester, England, where 22 people died in an explosion.

Police, however, have spoken only of “an improvised device” used in the attack.

IS says “a soldier of the caliphate planted bombs in the middle of Crusaders gatherings” then detonated them. It 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.

Prior to the terrorist group claiming responsibility for the attack, a school in northern England has identified one of the victims in the Manchester concert bombing as Georgina Callander, a former pupil.

Peter Rawlinson, deputy of the Bishop Rawstorne Church of England Academy in Croston, northwest of Manchester, told The Associated Press that the school confirmed Callander’s death with members of her family.

Rawlinson says “she was academically a very gifted student, very hard-working. Just lovely to speak to.”

The school posted a photo of Georgina on its website, smiling and look smart in her school uniform. It said she died of injuries from the attack and described her as “a lovely young student who was very popular with her peers and the staff.”