14 June, 2017
The country's Supreme Leader said the attacks will add to the hatred that Iranians harbor toward the US and Saudi Arabia.
In a condolence message ahead of a funeral for the victims, Ayatollah Ali Khamenei said the attack: "will not damage the Iranian nation's determination and the obvious result is nothing except an increase in hate for the governments of the United States and their stooges in the region like Saudi (Arabia)".
Meanwhile, Iran police chief Gen. Hossein Ashtari said several people with connections to the attackers were arrested around the capital area.
Iran denounced Donald Trump's reaction to deadly Islamic State group attacks in Tehran as "repugnant" on Thursday after the U.S. president warned the nation is reaping what it sows.
He stressed that "Washington has also demonstrated that it is the global Daesh" and "fighting terrorism would be impossible without fighting the United States", according to state IRIB TV.
"We know that the aim of (Iran) is to reach the focal point of Muslims and we will not wait until the fight is inside Saudi Arabia and we will work so that the battle is on their side, inside Iran, not in Saudi Arabia", Prince Mohammed said in a television interview.
In the meantime, Iran's Foreign Minister Javad Zarif on Wednesday implicitly pointed the finger of suspicion at Saudi Arabia for the terrorist attack in Tehran.
The funerals for those killed began on Friday morning in Tehran with a ceremony in parliament, with President Hassan Rouhani in attendance.
It's common for Iran's clerics and hardliners to chant, "Death to America", during rallies and after Friday sermons, but the chant from Iran's parliamentarians implies that they believe the United States was behind the attacks.
Iran said that the five Iranians who killed 17 people in twin attacks in Tehran were Islamic State group members who had been to its strongholds in Iraq and Syria. The report called the detainees "elements of the Wahhabi IS group", and said they were involved in operations, communication and logistics for the local Islamic State cell.
Last Wednesday's rare and coordinated attacks on Tehran left dozens of people wounded.
After prayers, a procession will leave Tehran University for the Behesht-e-Zahra cemetery, near the Khomeini mausoleum 13 kilometres (eight miles) south of the Iranian capital.