The search for survivors has ended, and investigators are trying to figure out what led to fiery explosion at a fertilizer plant in West, Texas, on Wednesday. At least 14 people are confirmed dead, many of them first responders.
Laura Sullivan tells Robert Siegel that she has been learning more about the older suspect, Tamerlan Tsarnaev. She's been talking with three women who knew him when they were in college — and they paint a dark picture.
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