(NEWSER) – A rights group is out with a story about an ISIS militant that manages to shock even against the backdrop of other Islamic State tales of horror.

In this case, a young fighter publicly executed his own mother, reports the Syrian Observatory for Human Rights. The group says the mother tried to persuade her son to leave ISIS, which he then reported to higher-ups, reports CNN. They ordered him to kill her for this "apostasy," and he dutifully shot her near the post office where she worked in Raqqa, Syria, before hundreds of onlookers, says the report.

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