Azerbaijan, Baku, July 22/Trend M. Moezzi
At ceremonies marking the first anniversary of Darioush Rezaeinejad's assassination, Iran's Intelligence Minister announced his killers had been arrested.
Heydar Moslehi, said the assassins tried hard to elude Iran's Intelligence Ministry but were unsuccessful, Fars news agency reports.
The Intelligence Minister said two networks responsible for training assassins had also been discovered in and outside Iran.
Rezaeinejad, a postgraduate electrical engineering student, was shot in the neck outside his daughter's kindergarten on July 23, 2011.
While the Iranian government denies he was anything but a student, Israeli intelligence has said Rezaeinejad was working on a nuclear detonator.
Rezaeinejad's death is one in a string of assassinations of Iranian nuclear scientists.
Mostafa Ahmadi Roshan and his bodyguard Reza Ghashghaei were killed in January 2012 when a bomb attached to their car door detonated. Majid Shahriari, a nuclear engineering professor was killed the same way in November 2010. Massoud Ali Mohammadi, a physics professor, was killed in January 2010 when a motorcycle exploded near his car.
In May Iran hanged Majid Jamali Fashi, 24, for the killing of Massoud Ali Mohammadi. The government said Fashi was a Mossad agent working for Israeli intelligence
In June Iran said it had arrested people responsible for the assassination of Mostafa Ahmadi Roshan, Reza Ghashghaei and Majid Shariari.