The Islamic State terrorist group claimed responsibility for the attack in a statement by its Amaq news agency. It was one of the group’s deadliest attacks against religious minorities in Pakistan this year, following a blast at a Sufi shrine in February that killed more than 70 people. Initial reports suggested that two assailants had approached the church before the attack. Officials said security personnel shot one to death while another reached the gate of the main hall. Authorities said they were searching for two other suspects believed to be accomplices. Rescue teams reached the church to evacuate the dead...