The Mississippi man arrested for sending poison letters to President Obama, a U.S. senator and a judge in Mississippi, appeared in court Thursday. His lawyer says he denies putting the toxin ricin in those letters.
The FBI is interested in two men seen in videos and photographs at Monday's Boston Marathon before two bombs went off. Investigators released photographs and asked the public to help identify the men on Thursday. Robert Siegel talks to Dina Temple-Raston has the latest.
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