with litvinenko. reporter: and what did that message say? look, there are people ready to kill you. reporter: the emails amounted to a hit list and the next name up alexander. reporter: alexander, as in litvinenko. scaramella says that is why he met with litvinenko in london to tell him about the hit list and to warn him. but, he says, litvinenko didn t buy it. he said, mario, don t care about that. reporter: he says, it s b.s.? i think it s just a provocation, but please check what s happening. reporter: but after what happened to litvinenko, scaramella says he takes the hit list seriously. are you frightened for your life? well, do you have another question? reporter: scotland yard questioned scaramella and eventually cleared him. why? because if your re looking for it polonium is traceable. using specialized equipment investigators were able to track
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