Buckingham Palace said Queen Elizabeth II is under medical supervision as doctors are "careful of Her Majesty's health".

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 Thursday's announcement comes the day after the 96-year-old monarch called a meeting of his private council and asked for calm.

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 The palace said the Queen was "at ease" and was at Balmoral Castle in Scotland

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 where she was spending the summer. Doctors advised him to rest

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 Prime Minister Liz Truss said

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 "The news from Buckingham Palace at lunchtime will concern the whole nation."

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 "My thoughts - and those of the whole of Britain 

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 are with the Queen and her family at this time," he wrote on Twitter.

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