The threat reportedly included an image of George next to a photo of his school in Battersea, south London, accompanied by its address and the caption "school starts early". Daesh is known to favour Telegram because messages are encrypted and keep the user's location hidden. However, British intelligence officials are monitoring the anonymous Telegram messaging service in an effort to protect the United Kingdom from potential terror attacks.
Cyber-security experts have labeled the messaging platform a "breeding ground" for terrorists.
The post also featured words in Arabic taken from a jihadi song which translates as "When war comes with the melody of bullets, we descend on disbelief, desiring retaliation".
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Security measures are expected to be increased at the school in response to the threats.
According to reports, ISIS extremists have threatened to attack Prince George at his London school posting a chilling warning on the web, alongside photos of the prince and his school. Concerns about security at George's school have already been raised after a woman filmed herself wandering its corridors unchallenged days before term started. Some weeks later, a second woman was placed under arrest for attempted burglary at the school.
There is no way of tracking the messages sent on Telegram, and internet surveillance firms are now beginning to trawl it more seriously after it emerged as a genuine way for Islamic State affiliates to message one another.
Shocking this is not the first time the royal family has been threatened online either. Spielman said with the platform being encrypted, it is safer for the Islamic extremists to communicate without fear of being traced.