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Buckingham Palace said on Thursday that Britain's Queen Elizabeth II is under "medical supervision".
doctors are concerned about her health
She ascended the throne in 1952 and, in June, celebrated her platinum jubilee, marking 70 years as queen.
Members of the British royal family are now gathering on his behalf at Balmoral.
UK Prime Minister Liz Truss said on Twitter on Thursday that her "thoughts - and those of the people of our United Kingdom - are with the Queen and her family at this time."
The whole country will be deeply concerned by this news.