US denies role in Iranian scientist's death

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WASHINGTON (AP) -- Secretary of State Hillary Rodham Clinton says the U.S. played no role in the killing of an Iranian nuclear scientist and says the U.S. is looking for an international understanding with Iran that ends its uranium enrichment program.

Clinton categorically denied any U.S. involvement in Mostafa Ahmadi Roshan's death.

Reports said two assailants on a motorcycle attached a magnetic bomb to Roshan's car, killing him and his driver Wednesday. Roshan was a chemistry expert and director of the Natanz uranium enrichment facility in central Iran.

Clinton called recent Iranian threats to close off the Persian Gulf "provocative and dangerous." She said the U.S. was committed to keeping the international waterway open. She called it "part of the lifeline that keeps oil and gas moving around the world."