Murder totals took an unexpected and upward turn in many big U.S. cities last year.
Will this will turn out to be just a one-year deviation from the nation's two-decade-plus drop in violent crime or is it a warning sign of bad times ahead for most urban centers?
Two leading criminologists say it's too early to tell, but they agree that the increase was too large to ignore.
Alfred Blumstein of Carnegie Mellon University . . .
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