By Jeremy Herb - 02/09/12 03:57 PM EST
The report quoted U.S. officials as saying the Obama administration is aware of the assassination campaign but does not have any involvement.
Israel’s Foreign Ministry declined comment, saying in a statement: "As long as we can't see all the evidence being claimed by NBC, the Foreign Ministry won't react to every gossip and report being published worldwide."
MEK released a statement last month saying that its involvement is “absolutely false.”
Last month’s assassination, the fifth Iranian scientist killed since 2007, further enflamed tensions between Iran and the West, as the United States and its allies seek to stop Iran from pursuing nuclear weapons and Iran has threatened to retaliate against economic sanctions and any potential military action.