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.

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