British spy agencies are monitoring the encrypted instant messaging app Telegram which ISIS has allegedly used to threaten the life of Prince George.
The Daily Star says its investigators have uncovered the hate-filled threat on the messaging service.
"Even the royal family will not be left alone," the post on Telegram warned.
It included a picture of the future king next to a photo of his school, Thomas's Battersea, in Battersea, south London.
The jihadists also included the school's address with the caption "school starts early".
The post also featured words in Arabic taken from a jihadi song which reportedly translates as: "When war comes with the melody of bullets, we descend on disbelief, desiring retaliation".
British intelligence officers are understood to be aware of the situation and are monitoring the Telegram app in an effort to stop potential ISIS attacks in the UK.
The Daily Star that reported people living and working near Thomas's Battersea have already raised concerns about security there after a woman filmed herself walking through the corridors unchallenged.
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