The charge is not a surprise, nor is the possibility of US involvement. Al Jazeera:
Iran says it has evidence the US was behind the killing of one of its nuclear scientists, according to Iranian state television. US officials last week denied any role in the killing of Mostafa Ahmadi-Roshan, and condemned the bomb attack which claimed his life in Tehran on Wednesday. However, Iran's state TV reported that the Iranian foreign ministry had, in a letter handed to the Swiss ambassador in Tehran, said : "We have reliable documents and evidence that this terrorist act was planned, guided and supported by the CIA."
