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Gunmen opened fire at an Iranian military parade in Ahvaz in the south-west of the country, killing several people and wounding at least 20 people, according to media reports.
The attackers fired from a park near the parade and wore military uniforms, according to reports.
State media believe that Islamist militants are behind the attack.
Iran celebrates the anniversary of the beginning of the 1980-1988 war with Iraq with several national parades.
Images of the scene show that wounded soldiers are brought to safety.
The shooting lasted about 10 minutes, but the security forces now control the situation, according to media reports.
Ahvaz was one of the cities to see major anti-government protests at the end of last year about declining standards of living.
