Most major terrorist attacks against the U.S. have originated abroad. But as details of the Boston Marathon bombings emerge, reports point to two young men of Chechen origin who were seemingly fully integrated into American society.
Information about brothers Dzhokhar and Tamerlan Tsarnaev has turned from a trickle into a flood this week, after police publicly identified them as suspects. Friends and former coaches say the people they remember don't seem capable of carrying out days of violence.
The bombing and its aftermath revealed a massive, highly coordinated homeland security apparatus that can organize a mass casualty disaster or lock down a major American city at a moment's notice. Or both.
One bombing suspect is dead and the other in custody after a week of investigation that led to a tense manhunt and standoff Friday. NPR's David Schaper joins Weekend Edition Saturday host Scott Simon with the latest on the Boston Marathon bombings aftermath.
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