Queen Elizabeth II under medical supervision as William, Harry, Meghan travel to be by her side

LONDON — Buckingham Palace says Queen Elizabeth II is under medical supervision as doctors are “concerned for Her Majesty’s health.”

The announcement on Thursday comes a day after the 96-year-old monarch canceled a meeting of her Privy Council and was told to rest.

The palace says the queen is “comfortable” and remains at Balmoral Castle in Scotland, where she has spent the summer.

Prince Harry and Duchess Meghan are traveling to Scotland to be by the queen’s side, their spokesperson confirmed to USA TODAY Thursday. Prince William is also traveling to Balmoral Castle to be with his grandmother, the Duke of Cambridge’s communication officer Daisy Northway confirmed.

Doctors have voiced concern for Queen Elizabeth II’s health.

A look at the British royal family tree,spanning four generations.

Queen Elizabeth II postpones Privy Council meeting: Doctors advise 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,” she said on Twitter.

Queen Elizabeth II to skip beloved Highland Games event due to continuing ‘mobility’ issues

The latest announcement comes a day after Buckingham Palace revealed Queen Elizabeth II postponed a meeting of senior governmental advisers known as the Privy Council after doctors advised her to rest.

The council had been scheduled to meet virtually on Wednesday, a day after the monarch had a full day of activities as she presided over the ceremonial handover power to the new prime minister at her summer residence in Scotland.

Truss would have taken the oath as First Lord of the Treasury, one of her other titles, and new Cabinet ministers would have been sworn in during the session. The meeting will be rescheduled.

Queen Elizabeth II has had continuing “mobility issues” over the past year.

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The decision is likely to spark renewed public concern about the health of Elizabeth, who marked seven decades on the throne this year. She has increasingly handed over duties to her heir, Prince Charles, and other members of the royal family in recent months as she struggled to get around.

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The queen’s latest postponement comes days after she decided to skip the Braemar Gathering, a popular Highland Games event she loves and attends every year, as she continues to struggle with issues getting around.

Last week, the monarch also decided to formally appoint Britain’s new prime minister on Tuesday at Balmoral Castle rather than make the more than 800-mile round trip to London for the traditional ceremony at Buckingham Palace.

Her eldest son and heir Prince Charles, who normally accompanies the monarch to the Highland Games, will attend in her stead.

Contributing: Amy Haneline, USA TODAY; The Associated Press 

This article originally appeared on USA TODAY: Queen Elizabeth health: Doctors are ‘concerned,’ Prince Harry visits