Hackers who targeted the private hospital which treated Kate, Princess of Wales, are threatening to release private medical information belonging to members of the Royal Family.

The gang broke into the computer systems of the King Edward VII’s Hospital and warned they aim to release ‘data from the Royal Family’ on Tuesday unless they are paid £300,000 in the cyber currency Bitcoin.

The ransom demand was made on the dark web, where the hackers posted images of what they claim are stolen files including X-rays, letters from consultants, registration forms, handwritten clinical notes, and pathology forms.

The gang said: ‘Unique files are presented to your attention! Data from the Royal Family! A large amount of patient and employee data. Sale in one lot!!’

GCHQ and police are investigating the attack by hacking gang Rhysida – named after a venomous tropical centipede.

The 56-bed private hospital in Marylebone has been used by the Royal Family for more than a century. The late Queen Elizabeth II was a patient and so was Prince Philip who spent almost a month being treated there before he died aged 99 in 2021.

The Princess of Wales was admitted there in 2012 with prolonged bouts of acute morning sickness during her first pregnancy. 

During her stay, two Australian radio DJs placed a hoax call and obtained private medical information about Kate – then the Duchess of Cambridge – which they then broadcast, forcing hospital bosses into an embarrassing apology. 

The nurse who unwittingly took the call later committed suicide over the prank.

Last night,…