The official news agency Fars had a picture that showed a known lebanese operative in Tehran waching the bombed car . This is definitly the work of the Iranian regime because the guy was antigovernemt. He was not a nuclear scientist he was a theoretical phycisits who worked on black-holes and dark matter and Yang-Mills theory. check his publications at Physical Reviews D!
Turkish jets take part in U.S.-led coalition strikes against ISIS for first time (Reuters)
from the article: Iran: Israel, U.S. killed pro-Mousavi nuclear scientist