We turn now to Robert McFadden, who is the senior vice president of The Soufan Group. He's a 30-year veteran of U.S. federal law enforcement, with a special focus on counterterrorism. Thanks for joining us in the program today. Walk us through what happens now. Let's say that the FBI is deluged with thousands of phone calls from people who think, rightly or wrongly, that they have seen one or both of these men before. What does the FBI do?
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And I'm Robert Siegel. A dramatic development today in Boston: The FBI announced that it is looking for two men they suspect of placing the bombs that killed three people at the Boston Marathon and injured more than 170. The FBI released both video and photos of the men at the site of the bombings. Here's Special Agent Richard DesLauriers.