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(Image: London media)

Posing with an AK-47, this is believed to be one of the Islamic State's youngest jihadists, aged just 13.

Identified as Belgian Younes Abaaoud, he is alleged to have followed his older brother to the front line in Syria.

Worryingly, he is thought to be among dozens of child fighters currently in the conflict zone where journalist James Foley was beheaded earlier this week.

(Image: London Media)

Shiraz Maher, an academic at the International Centre for the Study of Radicalisation, tweeted a picture of him.

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

It is believed that he and brother, Abdelhamid Abaaoud, 27, arrived in Syria earlier this year.

Belgian newspapers have reported that they are both the sons of a man named Omar, a shopkeeper who moved to the country from Morocco 40 years ago.

(Image: London Media)

The picture posted by Mr Maher is the second photograph reportedly showing Younes to surface online in weeks.

The previous image showed the youngster in a similar pose, with a gun in hand and finger pointed upwards.

Photographs reportedly showing Abdelhamid, who is said to go by the alias Abou Omar Soussi, have also emerged.

One was tweeted by a Belgian journalist who claimed its showed the fighter with a German militant named Abu Azzam.

(Image: London media)

He also posted a picture which he said showed Abdelhamid pointing a gun while sat in a car tyre.

Another image that is too graphic to reproduce appeared earlier this month of Australian terrorist Khaled Sharrouf's seven-year-old son holding a decapitated head.

Meanwhile a blond-haired French child was also pictured pointing his finger to the sky in a similar manner to Younes - it is believed his parents took him to Syria to join Isis.