The unnamed source said: “Intelligence agents believe the threats made against Kate are not idle and are linked to messages sent by Husnain Rashid.
“It’s a disgusting plot as it involves Kate’s young children, and hits out at her attempt to live a normal life like any mother wants to.”
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They added: “This is not run of the mill Twitter trolling. They are messages that are exchanged globally between jihadis that are often erased very quickly detailing attack plans.”
The Telegram website was used by the Islamic State supporter Husnain Rashid who called for supporters to kill Prince George.
Rashid, 32, is now serving at least 25 years for his part in the plot at Manchester’s Strangeways prison.
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