Report: ISIS fighter in Syria executes his mother in front of public audience.

Report: ISIS fighter in Syria executes his mother in front of public audience. https://t.co/9XjahDaNeh

— CNN Breaking News (@cnnbrk) January 8, 2016

ISIS had accused her of apostasy after her son turned her in, the activists said. She allegedly had been "inciting her son to leave the Islamic State." She wanted to escape with him and told him "that the coalition will kill all members of the organization."

The observatory reported that the victim, al-Qasem, was in her 40s. The activist group Raqqa is Being Slaughtered Silently reported that she was 35.