According to Ashoora news from Farsnews:
“No doubt, this terrorist and wicked incident has its roots in the failure of the avowed enemies in the face of the scientific move, honors and capabilities of the great Iranian nation and their successive defeats in the region and the global arenas,” Rouhani said in his message, adding, “This revived their [the enemies’] deep wickedness and spite in the minds of the world people like their other inhumane acts.”
He reiterated that such cowardly moves will not stymie Iran’s march towards progress.
First Vice President Es'haq Jahangiri
In a similar message, First Vice President Es'haq Jahangiri expressed his condolences over the assassination of the top nuclear scientist, stressing that such inhumane moves are doomed to failure.
Supreme Leader’s top advisor for International Affairs Ali Akbar Velayati
Also, Supreme Leader’s top advisor for International Affairs Ali Akbar Velayati said that the visible and invisible perpetrators of the assassination of martyr Fakhrizadeh should wait for the revenge of Iranian nation.
Head of the Atomic Energy Organization of Iran (AEOI) Ali Akbar Salehi
Meanwhile, Head of the Atomic Energy Organization of Iran (AEOI) Ali Akbar Salehi in message of condolences stressed that the nuclear scientist’s martyrdom will further strengthen Islamic Iran.
Iranian President’s Chief of Staff Mahmoud Vaezi
Moreover, Iranian President’s Chief of Staff Mahmoud Vaezi said that all the perpetrators behind the hypocritical assassination of Dr. Fakhrizadeh will soon be identified and harshly punished.
Fakhrizadeh's car was targeted by an explosion and machinegun fire in Damavand's Absard 40 kilometers to the East of Tehran.
Iranian Top Nuclear Scientist Martyr Mohsen Fakhrizadeh
The nuclear scientist and one of his companions were immediately taken to a nearby hospital but he could not be saved.
Eyewitness accounts confirmed that Fakhrizadeh's car came under attack first by a blast and then by terrorists who sprayed bullets at his car.
Early in 2018, the Israeli sources had acknowledged that Mossad had tried to assasinate an Iranian nuclear scientist, but its operation failed.
According to Fars News Agency, Mossad had gained access to Fakhrizadeh's name via a UN list which referred to him as a senior scientist of Iran's Defense Ministry's Physics Research Center.
Iranian nuclear scientists have been the target of the western and Israeli spy agencies' assassination attempts in recent years.
In June 2012, Iran announced that its intelligence forces had identified and arrested all terrorist elements behind the assassination of the country's nuclear scientists.
"All the elements involved in the assassinations of the country's nuclear scientists have been identified and arrested," Iran's Intelligence Ministry announced in a statement.
"A number of countries, whose territories and facilities had been misused by the Mossad-backed terrorist teams, have provided the Iranian officials with relevant information," the statement added.
"Over the course of the investigations, all other elements behind the assassinations of the Iranian scientists Massoud Ali-Mohammadi, Majid Shahriari and Mostafa Ahmadi Roshan as well as Reza Qashqaei (Roshan's driver) have been apprehended," the statement read.
"Some of the perpetrators of the assassination of Dr. Fereidoun Abbasi, the current head of Iran's Atomic Energy Organization, are among those arrested," the ministry added.
According to the statement, Iran's Intelligence Ministry had detected some of Mossad's bases within the territories of one of Iran's Western neighbors, which provided training and logistical support to the terrorist networks.
In the fifth attack of its kind in two years, terrorists killed a 32-year-old Iranian scientist, Mostafa Ahmadi Roshan, and his driver on January 11, 2012.
The blast took place on the second anniversary of the martyrdom of Iranian university professor and nuclear scientist, Massoud Ali Mohammadi, who was also assassinated in a terrorist bomb attack in Tehran in January 2010.
The assassination method used in the bombing was similar to the 2010 terrorist bomb attacks against the then university professor, Fereidoun Abbassi Davani – who became the head of Iran's Atomic Energy Organization - and his colleague Majid Shahriari. While Abbasi Davani survived the attack, Shahriari was martyred.
Another Iranian scientist, Dariush Rezaeinejad, was also assassinated through the same method on 23 July 2011.
In a relevant development in January, 2015, the Islamic Revolution Guards Corps (IRGC) announced that it had thwarted an attempt by the Israeli intelligence forces to assassinate an Iranian nuclear scientist.
“In the last two years, the Zionist enemy (Israel) was trying hard to assassinate an Iranian nuclear scientist, but the timely presence of the IRGC security forces thwarted the terrorist operation,” Deputy Chief Liaison Officer of Flight Guards Corps Colonel Ya’qoub Baqeri told FNA in 2015.