bushehr - Reuters - December 9 2010
Iran’s Bushehr nuclear power plant. Photo by Reuters
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Iranian Parliament Speaker Ali Larijani blamed Israel and the U.S. for the murder of an Iranian nuclear scientist on Saturday, AFP reported Sunday. Larijani was quoted in the Mehr news agency calling the killing an "American-Zionist act of terror."

He added that the death was "another sign of the degree of animosity in the United States… the Americans must think carefully about the consequences of such acts."

The semi-official ISNA news agency identified the victim as Darioush Rezaei, a 35-year-old physics professor involved in Iran's nuclear program, and said he was shot dead by gunmen on a motorcycle in front of his home in Tehran. Iran's official IRNA news agency also reported the killing but had few details on the attack or the man's background.

Despite UN and other sanctions, Iran has steadily moved ahead with its uranium enrichment work, the central aspect of its nuclear program and the process that is of deepest concern to the West because it can be used both to produce reactor fuel and material for nuclear warheads