Iran's elite Revolutionary Guards have pointed the finger at regional rival Saudi Arabia - a close U.S. ally - which Tehran accuses of funding extremism and groups including IS.
Saudi deputy crown prince Mohammed bin Salman talked about efforts to "counter terrorism and extremism" in a phone call with US Secretary of State Rex Tillerson yesterday.
The militant group's Amaq news agency released a video on Thursday evening showing what it claimed was a message from the Tehran attackers.
The intelligence ministry underlined that the operations 'are still going beyond Iranian borders to persecute the commanders of those criminals affiliated with the arrogant powers and their regional allies'.
Late on Saturday, Intelligence Minister Mahmoud Alavi said the alleged mastermind behind the attacks had been tracked down and killed outside the country.
Iranian parliament chief Ali Larijani expressed grave concern over a US Senate decision, with over 90 votes in favor, paving the path for new sanctions against the Revolutionary Guards and Iran.
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Iran's Foreign Minister Mohammad Javad Zarif also condemned as "repugnant" Trump's response to the twin terror attacks.
Saudi Arabia's foreign minister was quick to reject allegations that Riyadh was involved, saying on Wednesday that the country "condemns terrorist attacks anywhere they occur and we condemn the killing of the innocent anywhere it occurs".
Iran had denounced US President Donald Trump's reaction to the attacks in Tehran as "repugnant" after he claimed that Iran was reaping what it sows.
Ali Vaez, a senior Iran analyst with the International Crisis Group, told Gandhara, "Salafism and Persian culture are like oil and water, they don't mix".
This week's attacks at Parliament and the mausoleum of the Islamic Republic's founder Ayatollah Ruhollah Khomeini have exposed shortcomings within the Islamic Revolutionary Guard Corps, which was supposed to be protecting these potent symbols of Iran's revolution.
Although this is the first evidence of an IS presence inside Iran, the government has clashed in the past with both Kurdish Islamic militants and secular Kurdish separatists.
Iran's foreign minister on Thursday rejected Donald Trump's condolences for deadly attacks in Tehran, calling the USA president's words repugnant.
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