Iran also said its security forces killed the mastermind of the attacks on Saturday.
"The mastermind and main commander of the attacks on Parliament and the mausoleum of Ayatollah Khomeini was killed", Iran's Intelligence Minister Mahmud Alavi said in a televised programme on Saturday night.
Police in Iran killed four Islamic State suspects, two of them foreigners, in the southern province of Hormuzgan and seized explosives, guns and the group's flag, an Iranian news agency said on Monday.
Let there be no doubt that we will take revenge for today's attacks in Tehran, on terrorists, their affiliates and their supporters, he said, as cited by the news agency Mehr.
With the latest arrests, the number of people detained since June 7 in relation to the attacks in the capital or extremist cells has passed 50.
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. Several attackers stormed Iran's parliament and a suicide bomber targeted the shrine of Ayatollah Ruhollah Khomeini on Wednesday, killing a security guard and wounding several other people in rare twin attacks.
Iran said its security forces on Saturday killed the mastermind of the attacks, and arrested seven people suspected of helping the militants.
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Both attacks were claimed by Islamic State (IS, formerly ISIS/ISIL), the jihadist organization based in Iraq and Syria.
While ISIS claimed responsibility, Iranian officials have also suggested Saudi Arabia may have played a role - and Iran's foreign minister called the official US response "repugnant", after President Trump ended his expression of condolences for the victims with the message that "states that sponsor terrorism risk falling victim to the evil they promote".
After offering condolences to the families of the attacks victims, Alavi stressed that over the past few months the country's intelligence forces had neutralized over 25 terrorist cells.
In 1981, a bomb planted by an Iranian opposition group in Tehran killed 27 Iranian members of parliament and dozens of other officials.
The attack on the shrine of Khomeini is symbolically stunning.
Iranian lawmakers said the intelligence minister had assured them that "all Islamic state elements have been eliminated" in the country.
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