The killing of Abu Hayjaa al-Tunsi, a Tunisian jihadi, sparked a panicked hunt within the group's ranks for spies who could have tipped off the U.S-led coalition about his closely guarded movements. By the time it was over, the group would kill 38 of its own members on suspicion of acting as informants...."
http://www.cbsnews.com/news/isis-slaughters-dozens-of-its-own-in-hunt-for-spies/
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