Sensing a tip off from within the quarters, they went on a rampage to find the spy and in the process killing 38 of their own members.
On suspicion that they could have tipped off the U.S-led coalition, many jihadists have faced the ire of their own at the top rungs. Fearing the same fate, many have taken asylum in prisons and many fled, according to reports by Syrian opposition activists and Iraqi intelligence officials.
The uncertainly does not lie alone within the group, but has also perforated outside as it loses control over Iraq and Syria. An Iraqi government offensive recaptured the western city of Ramadi from IS, and a separate mission to recapture Fallujah is underway.