Iranian media reported on January 11 that Mostafa Ahmadi Roshan, 32, was killed by an attacker on motorcycle who attached a bomb to Roshan's car on a Tehran street. Roshan became the fifth Iranian nuclear scientist to be killed since 2007. Someone is sabotaging Iran's nuclear program. The following timeline tracks what appears to be a covert war between Iran and the West. (Meghdad Madadi/Fars News Agency/AP Photo)