I find several things about this article intriguing. First several quotes: "Professor Ardashir Hosseinpour, a world authority on electromagnetism, was until recently working on uranium enrichment at the facility in Isfahan" "The report said the physicist died from "radioactive poisoning" "news items said Hosseinpour died from "poison gas." "A website of expatriate Iranian communists said that several other scientists were killed or injured in the operation to kill Hosseinpour at Isfahan" "Radio Farda . . . said several days ago that the scientist died of "smoke inhalation." The facility manufactures Uranium Hexafluoride. It is a mildly radioactive, but intensely corrosive and flammable gas. Exposure to minute amounts can severely injure or kill. Given the fact that others were harmed at the same time it could be that an industrial accident and not malevolent actions are responsible.
Roadside bomb kills five border officers in western Iraq (AP)
from the article: U.S. website: Mossad killed Iranian nuclear physicist