ISIS has reportedly publicly executed at least two of its own fighters on charges of spying and embezzlement.
The London Independent reports that information came from The Syrian Observatory for Human Rights.
Unconfirmed reports say the men were beheaded - although it's possible they may have been crucified.
Meanwhile, Charlie Winter, programs officer at counter-extremism think tank the Quilliam Foundation, said he isn't surprised by the news.
"ISIS is known for crucifying those who have tried to rebel against them," he told the Independent.
"They do not flinch at killing anyone if they have committed a serious crime which goes against their interpretation of Sharia, such as usury or embezzlement," he said.
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