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.
The scene around Boston Friday was chaotic. Police were going house to house in Watertown as they searched for "suspect No. 2" in the bombings. "Suspect No. 1," known as "black hat," was said to be dead. People across the area were told to shelter in place.
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