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“All of those small mercenary countries that we see in this region are backed by America. It is Americans who instigate them and provide them with necessary means to commit these crimes,” Rouhani said before leaving for the U.N. General Assembly in New York.

Iran meanwhile summoned diplomats from Britain, Denmark and the Netherlands early Sunday for allegedly harbouring “members of the terrorist group” that launched the attack. Danish Foreign Minister Anders Samuelsen condemned the attack and stressed that there would be “consequences” if it turns out that those responsible have connections to Denmark.

Photo by Behrad Ghasemi via AP / AP

The ministry later summoned the UAE’s envoy as well over what it called the “irresponsible and insulting statements” of an Emirati adviser, according to the semi-official ISNA news agency. The UAE did not immediately acknowledge the summons.

Saturday’s attack, in which militants disguised as soldiers opened fire on an annual Iranian military parade in Ahvaz, was the deadliest attack in the country in nearly a decade. Women and children scattered along with once-marching Revolutionary Guard soldiers as heavy gunfire rang out, the chaos captured live on state television.

The region’s Arab separatists, once only known for nighttime attacks on unguarded oil pipelines, claimed responsibility for the assault, and Iranian officials appeared to believe the claim. The separatists accuse Iran’s Persian-dominated government of discriminating against its ethnic Arab minority. Khuzestan province also has seen recent protests over Iran’s nationwide drought, as well as economic protests.

The attack killed at least 25 people and wounded 60, according to the state-run IRNA news agency. It said gunmen wore military uniforms and targeted a riser where military and police commanders were sitting. State TV hours later reported that all four gunmen had been killed.