The news of the incident reached Balmoral, where the royal family stayed shortly after the incident.

Prince Charles, Prince Philip, and the Queen were the first to receive the message, and their reaction, according to Ingrid Seward, the royal expert and author, was a "dazed confusion."

In her 2017 book, My Husband and Me: The Insider Story of 70 Years of Royal Marriage, Ms. Seward describes the moment that breaks her heart.

She wrote, "The royal family who were vacationing in Balmoral in the highlands that summer did not suspect that the crisis would overwhelm them when they received word that Diana had died in a car accident in Paris.