State media say a bomb killed an Iranian nuclear scientist Wednesday, the latest in a series of similar attacks. Here is a look at other attacks against Iranian scientists in Tehran.

January 12, 2010: Roadside bomb kills physics professor Massoud Ali-Mohammadi.

November 29, 2010: Bombs placed on cars by motorcyclists kill nuclear scientist Majid Shahriari and wound nuclear physicist Fereidoun Abbasi. Iran blames the attacks on the U.S. Central Intelligence Agency and Israel's Mossad intelligence agency.

July 23, 2011: Gunmen shoot dead physicist Darioush Rezai.

January 11, 2012: Bomb place by motorcyclist kills professor and nuclear scientist Mostafa Ahmadi Roshan.