An attack on a Shiite Muslim shrine in Iran’s southern city of Shiraz on Sunday killed four people and injured at least eight others, Iranian media outlets said. No group immediately claimed responsibility for the attack on the Shah Cheragh shrine, which state news agency IRNA said had been carried out by terrorists. Later, Iranian Khabar TV channel said ISIS claimed responsibility for the attack. One of the suspected assailants was arrested while the other went on the run, according to Tasnim news agency.