Islamic State claimed responsibility for a deadly bomb blast inside a Shi'ite mosque in the northwestern Pakistani city of Peshawar on Friday, the group said in a statement.
It added the attack had killed at least 50 and injured more than 200 people.
Pakistani Police and hospital officials said earlier on Friday the attack killed at least 56 people.
The Lady Reading Hospital, where most of the victims of Friday's explosion were brought, said in a statement that 194 people were also brought in wounded.