WATCH LIVE | View of Balmoral Castle after Queen Elizabeth's death

Britain’s longest-reigning monarch, Queen Elizabeth II, has died in Scotland. She was 96. It is a moment that the United Kingdom has been bracing for, with an elaborate plan for “Operation London Bridge” mapping out what happens next. But it comes as a shock all the same. The Post’s Libby Casey will anchor coverage from Washington. Reporters in England will provide updates as this story develops. Read more: https://wapo.st/3L1EJCo. Subscribe to The Washington Post on YouTube: https://wapo.st/2QOdcqK Follow us: Twitter: https://twitter.com/washingtonpost Instagram: https://www.instagram.com/washingtonpost/ Facebook: https://www.facebook.com/washingtonpost/