The killing of a prominent nuclear scientist in Iran has the attention of the U.S. State Department, but they deny any involvement.

FOX News Radio's Jared Halpern reports:

Secretary of State Hillary Clinton is warning Iran to ratchet back recent sabre-rattling from government and military chiefs, but adds...

(Clinton) "I want to categorically deny any United States involvement in any kind of violence inside Iran."

A top Iranian nuclear expert was killed in a Tehran car bombing today, the latest hit in a string of unexplained mishaps to Iran's nuclear program.

While claiming no responsibility for the assassination, an Israeli general did say he won't be shedding a tear for the scientist.

In Washington, Jared Halpern, FOX News Radio

WATCH to learn moreĀ aboutĀ the Iranian scientist killed in a car bombing:


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