International Desk: Queen Elizabeth II, the UK's longest-serving monarch, has died at Balmoral aged 96.

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She died on Thursday afternoon at her Scottish estate, where she had spent much of the summer.

Buckingham Palace announced her death in a short statement, triggering 10 days of national mourning and an outpouring of tributes to her long life and record-breaking reign.

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The eldest of her four children, Charles, Prince of Wales, who at 73 is the oldest heir apparent in British history, becomes king immediately.

The queen's death came after the palace announced on Thursday that doctors were "concerned" for her health and recommended she stayed under medical supervision.

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All her children -- Charles, Princess Anne, 72, Prince Andrew, 62, and Prince Edward, 58, flocked to her Scottish Highland retreat, Balmoral.

They were joined by Charles's sons, Prince William, and his estranged brother Prince Harry.

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Two days earlier the queen appointed Liz Truss as the 15th prime minister of her reign and was seen smiling in photographs but looking frail and using a walking stick.

Queen Elizabeth II came to the throne aged just 25 in 1952 in the aftermath of World War II, joining a world stage dominated by political figures from China's Mao Zedong to Soviet leader Joseph Stalin and US president Dwight D. Eisenhower.

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Her 70-year reign straddled two centuries of seismic social, political and technological upheaval.

Sun News/MR

Queen Elizabeth died Balmoral aged

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