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December 15th, 2014
06:57 PM ET

How to spot a "lone wolf"

Gunfire erupted Tuesday at a Sydney cafe where a gunman held 17 hostages. The gunman has been identified as Man Haron Monis.  He probably acted alone and does not appear to be part of a broader plot, U.S. law enforcement and intelligence sources say.

CNN’s Brooke Baldwin spoke with Jeffrey Simon, Author of "Lone Wolf Terrorism" about the profiles of lone wolves