The killing of Al-Tunsi at the time caused the group kills 38 of its own members on suspicion of acting as informants.They were among dozens of Daesh members killed by their own leadership in recent months in a vicious purge after a string of airstrikes killed prominent figures.
"Others have disappeared into prisons and still more have fled, fearing they could be next as the terror group turns on itself in the hunt for moles, according to Syrian opposition activists, Kurdish militia commanders, several Iraqi intelligence officials and an informant for the Iraqi government who worked within Daesh ranks."
A mobile phone or Internet connection can raise suspicions. As a warning to others, Daesh has displayed the bodies of some suspected spies in public — or used particularly gruesome methods, including reportedly dropping some into a vat of acid.
Daesh "commanders don't dare come from Iraq to Syria because they are being liquidated" by airstrikes, said Bebars Al-Talawy, an opposition activist in Syria who monitors the terror group.
"ISIS minister of war" Omar Al Shishani
Over the past months, American officials have claimed that the US has killed a string of top commanders from the group, including its "ISIS 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 Daesh 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. As a result, those appointed to governor posts have asked not to be identified and they limit their movements, the Iraqi informant told The Associated Press."
The purge comes at a time when Daesh has lost ground in both Syria and Iraq. An Iraqi government offensive recaptured the western city of Ramadi from Daesh earlier this year, and other missions is underway to retake Fallujah, Mosul and and in Syria's Raqqa.
"They have executed dozens of fighters on charges of giving information to the coalition or putting (GPS) chips in order for the aircraft to strike at a specific area," said Rami Abdurrahman, who heads the Britain-based Syrian Observatory for Human Rights, referring to Daesh in Syria.
"The militants have responded with methods of their own for rooting out spies, said the informant. For example, they have fed false information to a suspect member about the movements of Daesh leader Abu Bakr Al-Baghdadi, and if an airstrike follows on the alleged location, they know the suspect is a spy, he said. They stop fighters in the street and inspect their mobile phones, sometimes making the fighter call any unusual numbers in front of them to see who they are."
After the killing of Al-Anbari, seven or eight Daesh officials in Mosul were taken into custody and have since disappeared, their fates unknown, said the informant.
Another Iraqi intelligence official said at least 10 Daesh fighters and security officials in Mosul were killed by the group in April on suspicion of giving information to the coalition because of various strikes in the city.
Mosul also saw one of the most brutal killings of suspected informants last month, when about a dozen fighters and civilians were drowned in a vat filled with acid, one senior Iraqi intelligence official said.
In the western province of Anbar, the Iraqi militant Wuhayeb was killed in a May 6 airstrike in the town of Rutba. Wuhayeb was a militant veteran, serving first in Al-Qaeda in Iraq before it became the Daesh group. He first came to prominence in 2013, when a video showed him and his fighters stopping a group of Syrian truck drivers crossing Anbar.
Wuhayeb asks each if he is Sunni or Shia, and when they say Sunni, he quizzes them on how many times one bows during prayer. When they get it wrong, three of them admit to being Alawites, a Shia offshoot sect, and Wuhayeb and his men lay the three drivers in the dirt and shoot them to death.
After Wuhayeb's killing, Daesh killed several dozen of its own members in Anbar, including some mid-level officials, on suspicion of informing on his location, and other members fled to Turkey, the two intelligence officials said. They spoke on condition of anonymity because they were not authorized to talk to the press.
Some of the suspects were shot dead in front of other Daesh fighters as a lesson, the Iraqi officials said.
"After the Tunisian militant Abu Hayjaa was killed on the road outside Raqqa on March 30, Daesh leadership in Iraq sent Iraqi and Chechen security officials to investigate, according to Abdurrahman and Al-Talawy, the Syria-based activist. Suspects were rounded up, taken to military bases around Raqqa, and the purge ensued. Within days, 21 Daesh fighters were killed, including a senior commander from North Africa, Abdurrahman said."
Dozens more were taken back to Iraq for further questioning. Of those, 17 were killed and 32 were expelled from the group but allowed to live, Abdurrahman and Al-Talawy said, both citing their contacts in the militant group. Among those brought to Iraq was the group's top security official for its Badiya "province," covering a part of central and eastern Syria. His fate remains unknown.
Non-Daesh members are also often caught up in the hunt for spies. In the Tabqa, near Raqqa, Daesh fighters brought a civilian, Abdul-Hadi Issa, into the main square before dozens of onlookers and announced he was accused of spying. A masked militant then stabbed him in the heart and, with the knife still stuck in the man's chest, the fighter shot him in the head with a pistol.
Issa's body was hanged in the square with a large piece of paper on his chest proclaiming the crime and the punishment. Daesh circulated photos of the killing on social media.
According to Al-Talawy, several other Daesh members were killed in the town of Sukhna near the central Syrian city of Palmyra on charges of giving information to the coalition about Daesh bases in the area as well as trying to locate places where Al-Baghdadi might be.
"There is chaos. Some members and commanders are trying to flee," Darwish said.
"Sherfan Darwish, of the US-backed Syria Democratic Forces, which has been spearheading the fight against Daesh in Syria, said there is panic in Daesh-held areas where the extremists have killed people simply for having telecommunications devices in their homes."
The US -led coalition has sought to use its successes in targeting Daesh leaders to intimidate others. In late May, warplanes dropped leaflets over Daesh-held parts of Syria with the pictures of two senior militants killed previously in airstrikes. "What do these Daesh commanders have in common?" the leaflet read. "They were killed at the hands of the coalition."
Abu Mohammed Al-Adnani
The "jihadis" have responded with their own propaganda.
"America, do you think that victory comes by killing a commander or more?" Daesh spokesman Abu Mohammed Al-Adnani said in a May 21 audio message. "We will not be deterred by your campaigns and you will not be victorious."
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