The attacks against Iranian scientists involved in the Nuclear program were carried out by Iranian dissidents founded, trained and armed by the Israeli intelligence service, the Mossad.
Five Iranian scientists were killed in different attacks, starting with 2007 until now, and the main suspects of these assassinations are the Israeli. NBC News confirms this theory.
Quoting Official United States sources, NBA says that the bombings were fulfilled by Iranian dissidents, founded by the Mossad. United States thinks that the Iranian dissidents group are terrorists.
U.S. officials say that the Barack Obama administration is aware of the details of this assassination campaign, but the country is not involved yet.
The bombings founded by the Israel has the purpose of delaying the Iranian nuclear program. Besides the assassinations of the scientists, at least two mysterious explosions took place in Iran last year, both targeting military objectives.