The woman in her 40s had warned her son that a U.S.-backed alliance would wipe out Islamic State and had encouraged him to leave the city with her.
She was detained after he informed the group of her comments, according to the British-based Observatory, which monitors the war through a network of sources on the ground.
Citing local sources, the Observatory said the 20-year-old man executed his mother on Wednesday near the post office building where she worked in front of hundreds of people in Raqqa, a main base of operations for the group in Syria.
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