Queen Elizabeth greets crowds from Buckingham Palace balcony
STORY: Four days of celebrations began on Thursday when a beaming Elizabeth waved to crowds from the balcony of Buckingham Palace after a military parade and Royal Air Force flypast.
She later led the lighting of the Principal Platinum Jubilee Beacon at her Windsor Castle home near London.
The 96-year-old, who has been forced to cancel a series of engagements recently due to an "episodic mobility problem," reluctantly pulled out of a service on Friday after experiencing "some discomfort" the previous day, the palace said.
