TEHERAN - Iran's Caretaker Foreign Minister Ali Bagheri Kani said that the assassination of Hamas Politburo Chief Ismail Haniyeh was not possible without US green light and intelligence support.

He made the remarks at Wednesday's extraordinary ministerial meeting of the Executive Committee of the Organization of Islamic Cooperation (OIC) held in Jeddah, Saudi Arabia, to discuss Haniyeh's assassination, among other things, according to a statement released by the Iranian Foreign Ministry.

Bagheri Kani described the Hamas chief's assassination as "only one instance of Israel's terrorist crimes," saying it was a "flagrant aggression against Iran's national sovereignty and territorial integrity."

ALSO READ: Iran files judicial case for Hamas chief's assassination, no one arrested yet

He called on the UN Security Council to hold Israel accountable for such violations, and bring those responsible to trial and punishment.

Bagheri Kani said the US responsibility as Israel's main supporter should not be overlooked in the "heinous crime," whose perpetration was not possible without the US green light and intelligence support.

He said in the absence of any appropriate action by the UN Security Council, Iran had no other alternative but to use its "inherent right to legitimate self-defense in the face of Israel's aggressions."

Bagheri Kani emphasized that such an action by Iran was necessary to prevent further "aggressions" by Israel against Iran's sovereignty, people and territory, and would be taken at the "required time and in a proportionate form."

READ MORE: Iran says Hamas chief killed by ‘short-range projectile’

Haniyeh, who had been invited to attend Iranian President Masoud Pezeshkian's swearing-in ceremony on Tuesday, was killed along with his bodyguard early Wednesday when their residence in Teheran was hit. Iran accused Israel of carrying out the attack and vowed "a harsh and painful response."