A senior nuclear physicist involved in Iran's nuclear program has died under mysterious circumstances two weeks ago. A report on a US website is saying that he was killed by Israeli's Mossad Professor Ardashir Hosseinpour, was a world authority on electromagnetism. He was until recently working in one of the central processing sites in Iran's nuclear program. Professsor Hosseeinpour was working on enrichment of uranium at the facility in Isfahan. The physicist died January 18, but news of his death was only reported six days later in two Iranian media outlets. A report released this weekend on Stratfor.com stated that the Mossad was behind Prof. Hosseinpour's death. The report said the physicist died from "radioactive poisoning" that was part of a Mossad effort to stop the Iranian nuclear program through "secret operations". The site indicates that in the late 1970s and early 1980s, the Mossad was involved in the deaths of scientists involved with the Iraqi nuclear program. It says that at least three scientists were killed during those operations. A website of expatriate Iranian communists is also reporting that several other scientists were killed or injured in the operation to kill Hosseinpour at Isfahan, and they were given treatment at nearby hospitals. Iranian physicians are trying to determine the circumstances of the deaths, and believe they may have to deal with similar incidents in the future. News of Hosseinpour's death appeared in the Al-Quds daily, published in Tehran, and in a release by the Iranian Students' News Agency. Both news items said Hosseinpour died from "poison gas." Radio Farda - a Persian-language station operated by the US government - said several days ago that the scientist died of "smoke inhalation." Prof. Hosseinpour, 45, was considered an expert in the field of electromagnetism and formerly taught in the physics department at Shiraz University. He has also been widely published in international publications. He was also recently employed by Isfahan's Malik Ashtar University of Technology. Several departments there have been implicated as being involved in Iran's so-called "secret nuclear program" that is being conducted in concert with its official, disclosed program. University Rector Mahdi Najad Nuri, a general in the Revolutionary Guards, was named a month ago on a UN Security Council list of people and institutions whose activity should be monitored for alleged contacts with Tehran's nuclear program. Scientists at the Isfahan facility have been converting natural uranium powder into a gaseous state so they can transfer the uranium to an uranium enrichment plant at Natanz. At that Natanz plant, the uranium flows into hundreds of centrifuges, where it undergoes the high-speed process of enrichment. Very interesting, if true, development. Is Israel becoming proactive?