Islamic State threatens attacks in Saudi Arabia

Seven people were arrested in Iran's northern province of Alborz in connection with the twin terrorist attacks that killed 17 on Wednesday, a judicial official was quoted as saying by Tasnim news agency.

Iranian police say they have arrested several suspects in their investigation into the attacks on parliament and the tomb of Ayatollah Ruhollah Khomeini, who led the 1979 revolution against the USA -backed shah and is considered the founder of the Islamic republic.

Iran also said its security forces killed the mastermind of the attacks on Saturday.

"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)", Khamenei wrote in a message of condolence to the families of the dead.

At least 41 ISIS members have been identified and arrested by Iran's intelligence forces in separate operations in Kermanshah, Kurdistan, West Azerbaijan and Tehran provinces.

The attack on Tehran was the worst in many years, and the first successful terror attack by Islamic State on Iran, if the group's claims are true.

Iranian Parliament Speaker Ali Larijani on Friday called the USA the "international" version of the Islamic State and accused Washington of exchanging democracy for money.

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.

While condemnations of the attacks poured in from around the world, US President Donald Trump refused to denounce the terror attacks and instead accused Iran of supporting terrorism.

The attack on the shrine of Khomeini is symbolically stunning.

Two of those killed were not Iranian, he said.

Shiites make up roughly 90 percent of Iran's population, but the country also has a sizeable Sunni minority, particularly around its restive borders with Iraq and Pakistan.

Riyadh "constantly supports" terrorists, the statement said, adding that the ISIS claim of responsibility "shows they (Saudis) are involved in this savage action". The sources from state security have pointed to Iranian Kurds affiliated with Islamic State the likely perpetrators.

Global leaders offered their support for the people of Iran, but it took longer for the White House.

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