What investigators are looking for in Boston
One of the blast sites on Boylston Street near the finish line of the 2013 Boston Marathon is investigated and guarded by police in the wake of two blasts in Boston Monday, April 15, 2013.
Elise Amendola/AP
A section of downtown Boston has become a closed-off crime scene the day after two explosions killed three and injured over 100 at the Boston Marathon.
Forensics expert John Goodpaster, director of the Forensic and Investigative Sciences Program at Indiana University Purdue University, joins The Daily Circuit to talk about the clues investigators are looking for to find out more about who made the explosive devices.
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