From the New York Times piece, Blaming US and Israel, Iran Reports Killing of Nuclear Scientist:

 Almost exactly two years ago in January 2010, a physics professor, Massoud Ali Mohammadi, was also assassinated in Tehran.

Iran blamed Israel and the United States for the attacks in 2010, and the latest killing is bound to deepen an embattled mood in Tehran as the country’s divided leaders approach parliamentary elections in March. News of the blast emerged quickly on Iran’s state-run media.

“The bomb was a magnetic one and the same as the ones previously used for the assassination of the scientists and is the work of the Zionists,” Fars quoted Tehran’s deputy governor, Safar Ali Baratlou, as saying, reflecting a suspicion that the West and its allies were waging a covert war.

In Washington, Tommy Vietor, a spokesman for the White House’s National Security Council, said in reaction to the attack: “The United States had absolutely nothing to do with this. We strongly condemn all acts of violence, including acts of violence like what is being reported today.”

Quite the Orwellian response from the US.  Since when has the US condemned all acts of violence?  That Navy Seal team must have really taken some heat over killing Osama Bin Laden.   And the Predator drone operators piloting drones in Yemen, Somalia, Pakistan, etc., must not have gotten the memo.   For a neatly summarized view of American operations that seem anything but condemnatory of violence, see the Long War Journal blog, a publication of the Foundation for the Defense of Democracies.

It is said that truth is the first casualty of war.  Actually, war reveals the truth, laying bare the propensities of its combatants to lie.