Britain's Queen has been put under medical supervision after doctors voiced concerns for her health.
Buckingham Palace issued a rare statement on the Queen's health on Thursday afternoon.
Her immediate family members have been informed, with the latest announcement escalating fears for the monarch’s health.
READ MORE: People baffled by Queen's handbag in photos of her meeting new British Prime Minister Liz Truss
The Prince of Wales and the Duchess of Cornwall, as well as the Duke of Cambridge, have all travelled to Balmoral, the Royal Family's residence in Scotland.
The head of state pulled out of a virtual Privy Council on Wednesday after doctors ordered her to rest, Mirror UK reports.
The statement said: "Following further evaluation this morning, The Queen’s doctors are concerned for Her Majesty’s health and have recommended she remain under medical supervision.
"The Queen remains comfortable and at Balmoral."
It comes just days after the Queen met with Liz Truss to officially appoint her as Britain's new Prime Minister.
Ms Truss sent a message on Twitter and said: "The whole country will be deeply concerned by the news from Buckingham Palace this lunchtime. My thoughts - and the thoughts of people across our United Kingdom - are with Her Majesty The Queen and her family at this time."
Labour leader Sir Keir Starmer said he is “deeply worried” by the news from Buckingham Palace and he is hoping for the Queen’s recovery.
He tweeted: “Along with the rest of the country, I am deeply worried by the news from Buckingham Palace this afternoon.
“My thoughts are with Her Majesty the Queen and her family at this time, and I join everyone across the United Kingdom in hoping for her recovery.”
Scotland’s First Minister Nicola Sturgeon said: “All of us are feeling profoundly concerned at reports of Her Majesty’s health.
“My thoughts and wishes are with the Queen and all of the royal family at this time.”
Wales’ First Minister Mark Drakeford said in a tweet: “Concerned to hear the news from Buckingham Palace.
“I send my best wishes to Her Majesty and her family on behalf of the people of Wales.”
The Duchess of Cornwall had been scheduled to open a new visitor centre for the Great Tapestry of Scotland in Galashiels, in the Scottish Borders, on Friday.
However, a royal spokesperson said that both she and the Prince of Wales had travelled to Balmoral, and it was “looking more likely” that the engagement would be cancelled.
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