Queen Elizabeth II passed away at Balmoral, her Scottish country residence, on Thursday with members of the royal family, including her children and heirs, at her side.

Iran PressEurope: The announcement came after her doctors earlier in the day were “concerned” for her health and were keeping her under medical supervision, a Buckingham Palace spokesperson said.

The 96-year-old British monarch was evaluated Thursday morning, the spokesperson said in a statement. The queen “remained comfortable,” the statement added.

Prince Charles and Camilla were at Balmoral, along with Prince William, Princess Anne, Prince Andrew, Prince Edward and his wife Sophie.

Earlier in the day, 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 had been suffering with mobility problems, and looked frail as she appointed Liz Truss as Britains new prime minister on Tuesday. She was forced to pull out of a Privy Council meeting the next day.

With over 70 years on the throne, Queen Elizabeth II was the longest-reigning monarch in British history. During her reign, the queen was served by 15 prime ministers—the first being Winston Churchill, in 1952—and 14 U.S. presidents.

Her 73-year-old son, Prince Charles, now becomes King Charles.

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