Via Daily Mail:

Clutching an AK-47 and pointing to the sky, this 13-year-old schoolboy is believed to be ISIS’ youngest jihadist and has joined a 5,000-strong army of European teenagers in Syria.

Younes Abaaoud, from Belgium, followed his older brother to the front line and is believed be among dozens of child-fighters in the war zone from Europe.

Brussels-born Younes is said to have travelled to Syria with his brother Abdelhamid Abaaoud, 27, earlier this year.

He wrote: ‘One of the youngest foreign fighters we know of Younes Abaaoud, who was 13 when he left Belgium to join ISIS.’