Following a slew of killings of prominent figures in the ISIS group, members of the Islamic State of Iraq and the Levant military group are executing their own men out of suspicion that there could be spies among them.

The major warning came to ISIS members when a senior commander with the group, Abu Hayjaa al-Tunsi, was bombed to death when a drone blasted his vehicle while he was driving through northern Syria in March.

Soon after the Tunisian Jihadi’s death, panic struck within the group’s members who thought a spy must have tipped off the U.S.-led coalition about his guarded movements. Based on assumptions that there could be an informant within the group, the ISIS killed 38 of its own members on suspicions of acting as informants.

Many disappeared into prison and the rest fled following the vicious purge, as the jihadi group turned on its own people, according to Syrian opposition activists, Kurdish militia commanders.

In ghastly tortures carried out by the group members, many were dropped into a vat of acid, while bodies of other suspected spies were displayed in public, as reported by Inquirer. In this context, it is worth mentioning that the ISIS killer dubbed Bulldozer caught the eye of the media with his brutal killings.

The fear of informants inside the group has sparked paranoia, so much so that a mobile phone or internet connection could raise massive suspicion. Ever since American officials declared that the U.S. has killed a handful of top commanders from the group, including Iraqi militant Shaker Wuhayeb, Omar al-Shishani and top financial official Abu Alaa al-Afari, the jihadis have become more suspicious of an informant who could be passing information to the other parties.

It was reported by Rami Abdurrahman, head of Britain-based Syrian Observatory for Human rights, that after the extremist group sharply reduced the salaries of its members in the wake of coalition and Russian airstrikes on ISIS, many members secretly turned to other parties for help. Haaretz states some ISIS fighters began supplying information to the coalition about movements and targets of the group’s top officials in order to earn some money.

Going by the statistics, at least 10 ISIS fighters and security officials in Mosul were executed by the group on suspicion of spies. To learn about ISIS attacks, click here.