Gunmen have opened fire on an Iranian military parade in the south-western city of Ahvaz, killing at least 25 people, including civilians, and injuring 60, state media say.
The attackers shot from a park near the parade and were wearing military uniforms, reports say.
An anti-government Arab group, Ahvaz National Resistance, and Islamic State (IS) have both claimed the attack.
President Hassan Rouhani has vowed a “harsh response”.
“The response of the Islamic Republic of Iran to the smallest threat will be harsh, but those who sponsor the terrorists must be held accountable,” he said in a statement.
Foreign Minister Javad Zarif blamed “terrorists paid by a foreign regime”, adding that “Iran holds regional terror sponsors and their US masters accountable”.
Iran has previously accused its regional rival, Saudi Arabia, of supporting separatist activity amongst Iran’s Arab minority.
Meanwhile, an Iranian military spokesman claimed the attackers were not from IS but “were trained and organised by two Gulf countries”, and had ties to the US and Israel.
What happened?
Fars news agency said the attack started at 09:00 local time (06:30 BST), lasted about 10 minutes, and appeared to involve four gunmen.
The attackers fired at civilians and attempted to attack military officials on the podium, Fars reports.
Nearly half of those killed were members of Iran’s Revolutionary Guard, reports say.
A number of civilians, including women and children, who were watching the military parade, were also among those killed, Irna news agency said.
However Irna said no journalist was among those killed, contradicting earlier reports.
There were also conflicting reports about the four attackers, with state media saying all four had been killed after local deputy governor Ali Hosein Hoseinzadeh said two of the four had been arrested.
Iran is marking the anniversary of the beginning of the 1980-88 war with Iraq with several military parades across the nation.
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Source: BBC
