January 11, 2012

Mostafa Ahmadi Roshan, 32, is killed by a bomb placed on his car by a motorcyclist in Tehran. According to the semi-official Fars news agency, Roshan was a university professor and nuclear scientist who supervised a department at Natanz uranium enrichment facility in Isfahan province. Fars cites witnesses as saying a motorcyclist stuck a magnetic bomb on the side of the car which then exploded, killing one and wounding two people inside.

December 11, 2011

At least seven people are reportedly killed in an explosion at a steel mill linked with Iran's nuclear program in the city of Yazd.

November 28, 2011

An explosion rocks the western Iranian city of Isfahan, home to key nuclear facility, according to a report by the semi-official Fars news agency, which adds that the blast is heard in several parts of the city.

November 12, 2011

A massive explosion at a military arms depot near Tehran reportedly kills 17 members of the Revolutionary Guards including a missile expert, and wounds 15, in what officials say they are treating as an accident.

July 23, 2011

Dariush Rezaeinejad, a 35-year-old member of Iran's Atomic Energy Organization, is reportedly shot dead by two gunmen firing from motorcycles. State-run media initially identify the victim as Darioush Rezaei, a physics professor and expert in neutron transport, but later backtrack and name him Dariush Rezaeinejad, an electronics PhD student who participated in developing high-voltage switches, a key component to setting off the explosions needed to trigger a nuclear warhead.

May 24, 2011

An explosion blamed on a technical problem reportedly causes a fire at an oil refinery during a visit by President Mahmoud Ahmadinejad. One person is killed and six injured but Ahmadinejad was not hurt and appeared on state television giving a scheduled speech to mark the inauguration of a new phase of the refinery in Abadan, south-western Iran, close to the Iraqi border.

November 29, 2010

Majid Shahriyari, a nuclear engineer, is reportedly killed in a bomb attack on his car. In a separate attack, Fereydoun Abbasi-Davani, a nuclear scientist subject to UN sanctions because of what Western officials said is his involvement in suspected nuclear weapons research, is allegedly wounded in a car bomb attack. (Davani now heads Iran's Atomic Energy Organization.)

January 12, 2010

Iranian university professor and nuclear scientist, Massoud Ali Mohammadi is assassinated in a bomb attack outside his Tehran home, say reports. Ali-Mohammadi is said to have publicly backed opposition leader Mir Hossein Mousavi in the disputed June presidential election, and Iranian pro-reform Web sites prior to the contentious government elections had listed his name among a list of 240 Tehran University teachers who supported the opposition.