Terrorist attacks in Tehran took place immediately after repeated threats of Saudi Arabia against Iran, PressTV reported quoting Iran's Ambassador to UN.

“The terrorist attacks in Tehran took place on the heel of the rejection on 2 May 2017 of any dialog with Iran by the Saudi defense minister and his utter threat, emphasizing that ‘we will work so that the battle is on their side, inside Iran,’” Iran’s Ambassador to the United Nations Gholamali Khoshroo wrote in the letter dated Friday. 

“It is not surprising either that the Saudi minister of foreign affairs had threatened Iran few hours before the attacks, saying that ‘Iran must be punished’.” 

The Iranian diplomat added that he had warned the Council about “the irresponsible, provocative, and ill-fated policies” of Saudi Arabia in promoting and financing extremist groups and its adventurism in the region, referring bombing of Yemen. He noted that the patronage for extremism, Riyadh “had been rewarded' recently by a hefty arms deal with the US.

He noted that it is not surprising that the situation in the region has worsened since the signing of the agreement and warned that “such a dangerous approach towards regional security and its grave consequences.”

Gunmen and suicide bombers on Wednesday carried out attacks on Iran’s parliament and the mausoleum of revolutionary founder Ruhollah Khomeini in capital city Tehran, injuring 52 people.

The Islamic State militant group has claimed responsibility for these attacks.