Morning Edition co-hosts Steve Inskeep and David Greene discuss the investigation of Monday's Boston Marathon explosions with Roger Cressey, a former counterterrorism investigator and member of the National Security Council, and NPR's Dina Temple-Raston.

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In the chaos and mayhem that followed the Boston Marathon bombing, many people were frantic to learn the fate of friends and loved ones who were either in the race or watched it from the sidelines.

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Boston hospitals always staff up their emergency rooms on Marathon Day to care for runners with cramps, dehydration and the occasional heart attack.

But Monday, those hospitals suddenly found themselves with more than 100 traumatized patients — many of them with the kinds of injuries seen more often on a battlefield than a marathon.

Like most big-city hospitals these days, Tufts Medical Center runs regular disaster drills, featuring simulated patients smeared with fake blood.