Parts of the Boston metropolitan area were full of police activity Thursday night amid a hunt for persons wanted in connection with the bombings at the Boston Marathon. David Greene and Steve Inskeep speak with NPR reporters Tovia Smith and Curt Nickisch who are in Boston for an update on what's known regarding the investigation.
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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