Concerns of the Queen's health are growing as Buckingham Palace have confirmed Her Majesty, 96, is under medical supervision at Balmoral Castle.
Members of the Royal Family are travelling up to Scotland to be by 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."
READ MORE- Queen Elizabeth under 'medical supervision' at Balmoral as immediate family travel to her side
The immediate Royal Family have been informed with the Prince of Wales, the Duchess of Cornwall and the Duke of Cambridge are said to be travelling to Balmoral, Clarence House and Kensington Palace both confirmed.
First Minister Nicola Sturgeon tweeted: "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."
The estate in Aberdeenshire has always had a special place in Her Majesty's heart and if she were to pass away in Scotland, a plan, known as Operation Unicorn, would come into action.
What's happening at Balmoral - follow our rolling news blog for updates on Her Majesty's health as we get them.
In the circumstances of the Queen’s death, parliamentary business at Holyrood and Westminster will be suspended immediately so the authorities can prepare for her state funeral.
It is also expected for thousands of people to venture to Scotland - with the Scottish Parliament, Holyrood and St Giles’ Cathedral identified as focal points for members of the public who wish to pay their respects.
The Queen's body will be moved from Balmoral down to Holyroodhouse in Edinburgh.
Then it will be carried up the Royal Mile to St Giles for a funeral service before being transported by the Royal Train which will take her back to London down the east coast mainline for the burial service.
