A number of armed assailants have opened fire at a military parade now underway in Ahvaz, southwest of Iran, Islamic Republic of Iran Broadcasting (IRIB) reported.
"The terrorists disguised as Islamic Revolution Guards Corps (IRGC) and Basiji (volunteer) forces opened fire to the authority and people from behind the stand during the parade", Governor of Khuzestan Gholam-Reza Shariati said, according to the state news agency IRNA.
At least 18 people were killed and more than 50 wounded in the 2017 attack that saw gunmen carrying Kalashnikov assault rifles and explosives storm the parliament complex where a legislative session had been in progress, starting an hours-long siege.
This is a developing story and will be updated accordingly.
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The official IRNA news agency said a woman and a child were among the wounded.
There was no immediate claim of responsibility.
The semi-official news agency Mehr said further shooting broke out as some of the attackers who managed to escape were being chased.
State television blamed "takfiri elements", a reference to Sunni militants, for the attack.
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ISNA published photographs of the attack's aftermath, with bloodied troops in dress uniforms helping each other walk away.
"Terrorists recruited, trained, armed, and paid by a foreign regime have attacked Ahvaz".
The bloodshed struck a blow to security in OPEC oil producer Iran, which has been relatively stable compared with neighboring Arab countries that have faced upheaval since the 2011 uprisings across the region.
The parade was marking the start of the Iran-Iraq War, which lasted between 1980 and 1988.
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Ahvaz is the capital of Iran's oil-rich Khuzestan province. The assault shocked Tehran, which has seen few militant attacks in the decades after the tumult surrounding the Islamic Revolution.