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 US-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.
They were among dozens of IS members killed by their own leadership in recent months in a vicious purge after a string of airstrikes killed prominent figures.
The fear of informants has fueled paranoia among the militants' ranks. A mobile phone or internet connection can raise suspicions. As a warning to others, IS has displayed the bodies of some suspected spies in public or used particularly gruesome methods, including reportedly dropping some into a vat of acid.
Over the past months, American officials have said that the US has killed a string of top commanders from the group, including its "minister of war" Omar al-Shishani, feared Iraqi militant Shaker Wuhayeb, also known as Abu Wahib, as well as a top finance official known by several names, including Haji Iman, Abu Alaa al-Afari or Abu Ali Al-Anbari.
In the northern Iraqi city of Mosul, the biggest city held by IS across its "caliphate" stretching across Syria and Iraq, a succession of militants who held the post of "wali," or governor, in the province have died in airstrikes.
The purge comes at a time when IS has lost ground in both Syria and Iraq. An Iraqi government offensive recaptured the western city of Ramadi from IS earlier this year, and another mission is underway to retake the nearby city of Fallujah.
Rami Abdurrahman, who heads the Britain-based Syrian Observatory for Human Rights, said some IS fighters began feeding information to the coalition about targets and movements of the group's officials because they needed money after the extremist group sharply reduced salaries in the wake of coalition and Russian airstrikes on IS-held oil facilities earlier this year.
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