[10][11][12] On June 13, the Commander of Iran's Islamic Revolutionary Guard Corps (IRGC), Major General Mohammad Ali Jafari, stated that the terrorist attacks were carried out at the demand of Riyadh.

[1] President of Iran Hassan Rouhani stressed greater rights for minorities, including Iranian Sunnis, and he made engagement efforts an element of his successful re-election campaign.

However, areas such as the southeastern province of Sistan and Baluchistan have had persistent conflicts with Sunni extremist cells, including assassination attempts by the militants.

On 8 June 2017, Iran's intelligence minister, Mahmoud Alavi, remarked that the government had broken up "a hundred terrorist plots" over the past two previous years alone.

[19] On 3 May 2017, Saudi deputy crown prince, Mohammad bin Salman, accused Iran of aiming to wrest control over Islam's holiest site in Mecca and threatened action.

[21] According to a statement given by Hossein Zolfaghari, the Iranian deputy Minister of Interior, to the Islamic Republic of Iran Broadcasting, four militants entered the Parliament's administrative building disguised as women.

[1] The ISIL outlet Amaq News Agency released footage purportedly from a terrorist as he undertook the shooting, captured on the man's smartphone.

It was announced that the full identities of the assailants had been determined after intelligence work by the Ministry, and only the militants' first names were released given that surnames had to be withheld due to certain social and security considerations.

[33] According to the Intelligence Ministry, the five individuals involved in carrying out the attacks had a history of past terrorist activities and links to groups with extremist, Wahhabi and Takfiri related beliefs.

[36] On 9 June, the Lieutenant Commander of the Islamic Revolutionary Guards Corps (IRGC), Brigadier General Hossein Salami, argued that the attacks in Tehran were the outcome of a trilateral project with Americans, Israelis, and Saudis working together.

Salami said that the terrorist strikes aimed at undermining Iran's political and security power after its enemies' back-to-back defeats in regional disputes and proxy warfare over the past years.

[11] On 13 June, the main IRGC Commander, Major General Mohammad Ali Jafari, stated that the terrorists carried out their actions at the demand of Riyadh.

"[13][14] Reza Seifollhai, the deputy head of Iran's Supreme National Security Council, stated that he believed the militants were native Iranians that the external group had recruited.

On 8 June, the government released photographs of five deceased assailants and disclosed their first names; additional information such as their surnames were held back for security purposes.

[46] Iranian Minister of Foreign Affairs Javad Zarif condemned the terrorist attack in Tehran saying, "terrorism is a problem that we face in the Middle East and the whole world".

"[8] Two days later while addressing a funeral ceremony for the victims of the attack, Larijani underlined that terrorists tried to undermine the democratic and religious foundations of the nation, but they failed to do so.

"[12] Tehran Mayor Mohammad Bagher Ghalibaf tweeted "Martyrdom of our dear citizens in a terrorist attack have created deep scars on our hearts.

[21] Supreme National Security Council Secretary Ali Shamkhani also stated that authorities had apprehended several people suspected of planning bomb attacks.

[81] Adel al-Jubeir, the Foreign Affairs Minister of Saudi Arabia, denied his country's involvement in the attacks and said Riyadh had no knowledge of who had committed them.

While stating that his administration is unwilling reestablish normal diplomatic ties with Iran, he additionally condemned the terrorist attacks and "the killing of the innocent anywhere it occurs.

"[82] Supreme Leader Ayatollah Ali Khamenei remarked in a 9 June message that the attacks had spread hatred towards the Saudi government, which he labeled one of the "stooges" of the U.S.[40] A state funeral held on 9 June 2017 at the Parliament's headquarters was attended by Iranian officials such as President Hassan Rouhani, Parliament Speaker Ali Larijani, and Chief Justice Sadeq Larijani.

[83] He remarked that the "terrorists fell short of their aim" yet still managed to blindly target civilians and mere state employees before the attacks ended.

Upon arresting the terrorists, Iranian authorities found weapons, bomb materials, explosive belts, communications equipment, and forged documents.

Iranian security forces announced that day that their intelligence efforts succeeded in finding and killing the mastermind and main commander behind the attacks.

Afterward, the Iranian Ambassador to the United Kingdom, Hamid Baeidinejad, declared that the strikes "manifested the will and capacity of Iran to fight against terrorism and security threats.

It specifically read that the "IRGC warns the Takfiri terrorists and their regional and trans-regional supporters that they would be engulfed by its revolutionary wrath and flames of the fire of its revenge in case they repeat any such devilish and dirty move in future.

"[39] Some Iranian sources suggested that the IRGC chose Dayr al-Zawr given that the city had begun to serve as the primary center of assembly, command, and logistics for ISIL militants lately where the terrorists had moved ground after defeats in Aleppo and Mosul over the previous months.

The same day as the launch, Ayatollah Khamenei held meetings with the families of Iranian personnel fighting inside both Iraq and Syria, the leader giving a speech stressing the need for continued action outside of Iran's borders.

[citation needed] The day after the strike, the IRGC released official footage depicting moments in which the missiles successfully hit their targets.

As well, Amir Ali Hajizadeh, the commander of the IRGC's Aerospace Force, stated the videos showed them that "the missiles precisely hit their targets.