As their on-ground operation wanes under pressure from allied forces in Syria, ISIS is still voicing threats on the messaging app Telegram, and this time calling out the apex family of Britain. The group reportedly posted picture of young Prince George out front his prestigious private school in South London with the caption: “Even the royal family will not be left alone.”

The message allegedly also included words from a jihadi song which translate as, “When war comes with the melody of bullets, we descend on disbelief, desiring retaliation.”

A Daily Star investigation uncovered the vile messages, and were told by security experts it was critical to monitor the messaging service.

Telegram has been branded a “breeding ground” for terrorists after ISIS extremists behind the 2015 Paris attacks used the encrypted messaging app to spread propaganda.

ISIS also used the app to recruit the perpetrators of the Christmas market attack in Berlin last year and claim credit for the massacre.

Barry Spielman, whose internet surveillance firm Sixgill has been tracking Telegram channels since the start of the year, told the Star: “Now we are seeing explicit threats.

“It seems that as Isis continues to lose ground in Syria and Iraq, it has stepped up its threats to hit the West.”

People working at Prince George’s school, Thomas’s Battersea, have already raised concerns about his safety.

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