U.S. cities see unexplained rise in violent crime this year

CHICAGO – Violent crimes — from homicides and rapes to robberies — have been on the rise in many major U.S. cities, yet experts can’t point to a single reason why, and the jump isn’t enough to suggest there’s a trend.

Still, it is stumping law enforcement officials, who are seeking a way to combat the problem.

http://www.startribune.com/officials-vexed-by-violent-crime-rise/381920621/