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Majid Shahriari was killed and his colleague Fereydoon Abbasi Davani was injured when men on motorcycles attached bombs to their cars in different parts of the capital as they made their way to work, police said.
In January, Masoud Ali Mohammadi, another Iranian nuclear scientist involved with the SESAME project, was killed in a bomb attack which Tehran blamed on "mercenaries" in the pay of Israel and the United States.