Yet another Iranian nuclear scientist has been murdered, this time after two assassins on a motorcycle attached a magnetic bomb to the 32-year-old chemistry expert's car. The death of Mostafa Ahmadi Roshan comes almost exactly two years to the day since another nuclear professor was killed. Roshan, a professor and director of Natanz, Iran's main uranium enrichment site, had apparently planned to attend a memorial for that man today.
Roshan's murder is fueling suspicions that a clandestine operation designed to disrupt the country's nuclear program is under way. The AP reports that the Tehran attack closely resembled the earlier killings of nuclear scientists—and Iranian officials are pointing a finger at Israel. "The magnetic bomb is of the same types already used to assassinate our scientists," said one. (Read more nuclear program stories.)