At least 15 people have been killed and 40 others injured in an attack on the Shia religious Shah Cheragh shrine in Shiraz, southern Iran on Wednesday.
A woman and two children are also reportedly among the dead.
According to a report by the Islamic Republic News Agency, the attack took place in evening and was conducted by three men who managed to enter the shrine.
According to the provincial police commander, the assailant opened fire on worshipers inside the shrine compound before being overpowered and apprehended by security guards.
Police caught two attackers while one managed to run off.
Islamic State of Iraq and Syria (ISIS) accepted responsibility for the attack through telegram.
An Iranian state-affiliated news outlet reported that the assailants were not Iranian nationals.
The provincial government stated that the attacker intended to target congregational prayers, but the shrine staff shut the doors to the main prayer hall.
Iran’s President Ebrahim Raisi has condemned the attack on a popular Shrine, saying the “evil act” will “not go unanswered.”
Raisi went on to say that Iran’s security personnel will identify the attack’s planners and perpetrators and respond.
Iran’s Interior Minister, Ahmed Wahedi, also denounced the attack, saying that the recent wave of turmoil in Iran is taking “dangerous turns” and that terrorists are “taking advantage of the unrest.”
The attack on Wednesday happened amid massive demonstrations across Iran over the death of a young Iranian woman, Mahsa Amini who was tortured by Iranian morality police for not wearing proper attire.