The royal family’s website appeared to have been taken off-line following the news of the Queen’s health concerns.
An error message appeared on screen reading: “Gateway time-out”. The Queen is under medical supervision at Balmoral and her family is travelling to her side.
A Palace spokesperson 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.”
The Queen’s immediate family members have been informed, with the latest announcement escalating fears for the monarch’s health.
The head of state pulled out of a virtual Privy Council on Wednesday after doctors ordered her to rest.
Prime Minister Liz Truss 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.”
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.”
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.”