The Islamic State terror group claimed responsibility for two explosions in Iran on January 3 that killed nearly 100 people attending a memorial service for a former Iranian commander killed in a US airstrike four years ago.
On January 4, the group released a statement on its associated Telegram channels and website claiming responsibility for the blasts.
The statement claimed that two suicide bombers detonated their explosive vests as Shia devotees of Revolutionary Guard commander Qasem Soleimani gathered near his grave in the city of Kerman on the anniversary of the assassination.
Iranian officials announced that 84 people were killed and 284 injured in the explosions.
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The attack heightened fears of a widening conflict in the region as Israel continues its war against Hamas in the Gaza Strip.
An aide to the Iranian president previously blamed Israel and the US for the explosions.
Washington has denied the accusations.
"The US was not involved in any way, and any suggestion to the contrary is ludicrous," State Department spokesman Matthew Miller said.
"We have no reason to believe that Israel was involved in this explosion," he added.
President Ibrahim Raisi promised that the perpetrators would soon be identified and punished for their "heinous act".
Iranian Foreign Minister Hossein Amir-Abdolahian said on the X Network that Tehran was acting through the United Nations, without giving other details.
The United Nations Security Council condemned the attack in a statement on January 4.
"Members of the Security Council stressed the need for the perpetrators, organizers, financiers and sponsors of these terrorist acts to be held accountable and brought to justice," the Security Council statement said.
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