The IS had claimed responsibility for the suicide bombings and gun attacks on parliament and the mausoleum of Islamic Republic's founder, Ayatollah Ruhollah Khomeini, on Wednesday.

Dozens of suspected "agents" of the Islamic State group have been arrested following the deadly attacks in Tehran, Iran's intelligence ministry and a website close to the judiciary said on Friday.

"Such acts will have no other result than to reinforce hatred for the U.S. government and its agents in the region, like the Saudi (government)", he wrote.

Authorities said Saturday that they identified and arrested an IS-affiliated cell of some 60 members in the suburb of Tehran, Iran's IRNA news agency reported.

An Iranian journalist claimed on Twitter that a woman arrested by authorities was a mastermind behind the attacks.

The militant group's Amaq news agency released a video on Thursday evening showing what it claimed was a message from the Tehran attackers.

In his remarks in the funeral, Parliament speaker Ali Larijani rapped Saudi Arabia and the US for the current situation in the Middle East and indirectly for the terror attacks in Tehran.

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When the prime minister visited the west London site of the fire on Thursday she spoke only to emergency services. A resident in a nearby building watches smoke rise from a building on fire in London , Wednesday, June 14, 2017.

Up to 50 people have been arrested in Iran in connection with terrorist attacks in Tehran last week that left 17 people dead.

During the funeral, Parliament Speaker Ali Larijani called the US the "international" version of the Islamic State group and said Washington had exchanged democracy for money, a reference to a recent huge arms deal between the USA and Saudi Arabia.

Khomeini's successor and the current Supreme Leader, Ayatollah Ali Khamenei, as well as the speaker of Iran's parliament, Ali Larijani, both tried to downplay the seriousness of the attacks.

There have been attacks on the Saudi security forces and the country's minority Shiite population and on Medina- one of the holiest sites in Islam.

Iranian lawmakers said the intelligence minister had assured them that "all Islamic state elements have been eliminated" in the country.

The pragmatist president championed a nuclear deal with the United States and five other powers in 2015 that led to the lifting of most sanctions against Iran, in return for curbs on its nuclear programme.