Iran has accused the United States and Israel of collaborating to assassinate a scientist with potential links to the nation’s nuclear program. Darioush Rezainejad was gunned down outside of a kindergarten in Tehran on Saturday as he went to pick up his daughter. While his ties to Iran’s nuclear program remain unclear, his death bore similarities to the killing and attempted killing of several other Iranian nuclear specialists. In November, men on motorcycles attached a bomb to a vehicle owned by the head of Iran’s Atomic Energy Organization. On the same day, Majid Shahriari, manager of a major nuclear project, was killed, and his wife and driver were wounded, in a similar operation. In January of 2010, Iranian particle physicist, Masoud Ali Mohammadi, died after a bomb attached to his motorcycle was detonated by remote control. In addition to the killings, the United States and Israel have been accused of perpetrating a sophisticated cyber attack against Iran’s nuclear program. Last year, President Mahmoud Ahmadinejad admitted the so-called Stuxnet computer worm damaged a number of centrifuges used to enrich uranium at Iran’s nuclear reactors.