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Someone who was washing dishes in the pine bar or in a hotel, cleaning crew, do we know, ultimately? >> five months after litvinenko's death, scotland yard issued an arrest warrant for lugovoi. kovtun's would come later. the two responded with a press conference in moscow stating their innocence. [ speaking russian ] >> russia refused to extradite them, so we traveled to moscow to find the men who are wanted in connection with litvinenko's murder. coming up, the stakes get even higher as we confront a top russian official when "dateline" continues. saturdays happen.

People were unwittingly exposed. >> do we know, ultimately, what the final cost of this use of polonium is? someone who was washing dishes in the pine bar or in a hotel, cleaning crew, do we know, ultimately? >> reporter: five months after litvinenko's death, scotland yard issued an arrest warrant for lugovoi. kovtun's would come later. the two responded with a press conference in moscow stating their innocence. [ speaking russian ] >> reporter: russia refused to extradite them, so we traveled to moscow to find the men who are wanted in connection with litvinenko's murder. coming up -- the sta...

Polonium is? someone who was washing dishes in the pine bar or in a hotel, cleaning crew, do we know, ultimately? >> reporter: five months after litvinenko's death, scotland yard issued an arrest warrant for lugovoi. kovtun's would come later. the two responded with a press conference in moscow stating their innocence. [ speaking russian ] >> reporter: russia refused to extradite them, so we traveled to moscow to find the men who are wanted in connection with litvinenko's murder. coming up -- the stakes get even higher as we confront a top russian official. when "dateline" continues. with this...

>> do we know, ultimately, what the final cost of this use of polonium is? someone who was washing dishes in the pine bar or in a hotel, cleaning crew, do we know, >> reporter: five months after litvinenko's death, scotland yard issued an arrest warrant for lugovoi. kovtun's would come later. the two responded with a press conference in moscow stating their innocence. [ speaking russian ] >> reporter: russia refused to extradite them, so we traveled to moscow to find the men who are wanted in connection with litvinenko's murder. coming up -- the stakes get even higher as we confront a top russ...

Off the charts. paul joyal wonders how many people were unwittingly exposed. >> do we know, ultimately, what the final cost of this use of polonium is? someone who was washing dishes in the pine bar or in a hotel, cleaning crew, do we know, ultimately? >> reporter: five months after litvinenko's death, scotland yard issued an arrest warrant for lugovoi. kovtun's would come later. the two responded with a press conference in moscow stating their innocence. [ speaking russian ] >> reporter: russia refused to extradite them, so we traveled to moscow to find the men who are wanted in connection wi...