Iran has arrested nearly 50 people in connection with twin attacks on Tehran that killed 17 people last week, officials said, as security forces stepped up efforts to crack down on suspected militants.
Iranian security officials counter that it is their regional rival Saudi Arabia - a close USA ally - that is responsible for funding and spreading the extremism that underpins IS.
During a speech that was planned before the attack on June 7, Iran's Supreme Leader Ayatollah Ali Khamenei addressed the attacks and linked them to Iran's support for the governments of Iraq and Syria in their fights against IS.
Although the USA military is also fighting IS in Syria, as well as Iraq, President Donald Trump said in response to the attacks in Iran that the country is reaping what it sows.
At least 41 IS suspects have been arrested since the attacks, according to Alavi, who said Iran has dismantled suspected militant cells with increasing frequency in recent months.More news: Steve Scalise still 'critical ... but has improved,' hospital says
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"The five known terrorists... after joining the IS terrorist group, left the country and participated in crimes carried out by this terrorist group in Mosul and Raqa", the intelligence ministry said in a statement.
Also, the intelligence office of Iran's Fars province announced that seven people affiliated to terrorist groups were arrested in an operation on Thursday and Friday, semi-official Mehr news agency reported on Saturday. This person is an Iranian Kurd from Paveh who known as a prominent recruiter for ISIS in Iranian Kurdistan.
The statement did not say whether the attackers were Iranian citizens. Although the United States military is also fighting ISIS in Syria, as well as Iraq, President Donald Trump said in response to the attacks in Iran that the country is reaping what it sows. Daesh reportedly claimed responsibility for the attack. However, it stopped short of directly blaming the kingdom for the attack, though many in the country expressed suspicion Iran's regional rival had a hand in the attack.
According to the Guardian, this the first attack conducted by ISIS inside majority-Shia Iran. Iranian forces are backing embattled Syrian President Bashar Assad while the Shiite power also is supporting militias fighting against the extremists in Iraq.
Bombers and gunmen killed 17 people in Iran's parliament and near the mausoleum of the Islamic Republic's founder, Ayatollah Khomeini, on Wednesday, in rare strikes on the capital that exacerbated regional tensions.
Riyadh and Washington both condemned the attacks, which came soon after Saudi Arabia and other Sunni-ruled countries cut ties with Qatar over its alleged support for Islamist militants and closer ties with Iran.