"Most of the people that I talked to believe that most of this activity — at least the violent part — is probably being carried out by Israel. There is a little bit of debate about the US role is. US officials tend to indicate that we don’t have any role in the lethal actions, but it’s quite clear that the US has been involved in cyber attacks, sabotage, and perhaps encouraging Iranian scientists to defect to the West."
Mostafa Ahmadi-Roshan, a nuclear scientist was killed in a car explosion in Tehran on Wednesday. A motorcyclist stuck an apparent bomb to Ahmadi-Roshan’s car, and he and another unidentified person were killed in the attack.
Several Iranian nuclear scientists have been assassinated in recent years, with Iran blaming Israel and the US. Both countries deny the accusations.