A police officer stands guard as vehicles drive in front of Iran's.
But Intelligence Minister Mahmoud Alavi said on Thursday that "we still can not judge that Saudi Arabia has had a role in this terrorist incident". Saudi Arabia has said it was not involved. But no proof or specifics were offered. IS has also claimed multiple attacks inside Saudi Arabia. Intelligence officials later stated that they thwarted a third attack.
Leader of the Islamic Revolution Ayatollah Seyyed Ali Khamenei has penned a letter condoling with the survivors of the recent terror attacks, saying such crimes can not work to harm the Iranian nation's determination.
"The commander of this terrorist group was based in the border regions, but after the attacks he left the country", Mr Alavi was quoted as saying by state broadcaster IRIB yesterday.
According to Fazelian, seven of the individuals were arrested in Fardis, in southern Alborz, and one in Karaj, the provincial capital. Two of the victims were women, it added, citing official figures. He did not elaborate.
On Friday, Iranian authorities arrested 41 people in connection to the Tehran attacks, the authorities could identify only one attacker, Serias Sadeghi.
It says four attackers launched Wednesday's assault on parliament, which has wounded at least eight people. The ministry said the men had fought for IS in Mosul, Iraq, and Raqqa, Syria, before returning to Iran last August.
Documents and equipment "for carrying out terrorist operations" were also seized, the ministry said in a statement.
Seattle's 'March Against Sharia' set for City Hall Plaza
Update Required To play the media you will need to either update your browser to a recent version or update your Flash plugin . It's time we stop listening to them. "Freedom to practice one's religion in peace is afforded to each of us by the U.S.
Iran is a key backer of Assad amid his country's six year long civil war.
IS had carried out attacks in Saudi Arabia in the past, targeting the Kingdom's Shia population. The Islamic State group claimed the attacks.
Iran is a key fighting force against IS and other groups in Iraq and Syria, and the Sunni jihadists consider Shiite Muslims to be apostates.
The country's Supreme Leader said the attacks will add to the hatred that Iranians harbor toward the US and Saudi Arabia.
State television reported the increase Thursday, citing Ahmad Shojaei, the head of the country's forensic center.
Foreign minister Mohammad Javad Zarif dismissed what he called the "repugnant White House statement".
As a mark of respect to victims of the Tehran attacks, the Eiffel Tower's lights will be turned off at midnight, Paris mayor Anne Hidalgo said on Twitter.