Britain's Prime Minister David Cameron, left, and London's Mayor Boris Johnson wait for the start of the Opening Ceremony at the 2012 Summer Olympics, Friday, July 27, 2012, in London. (AP Photo/Jae C. Hong)
Gallery: World dignitaries arrive for Olympics
Jul. 27, 2012 @ 02:55 PM
Heads of state began arriving this afternoon at Buckingham Palace in London for a reception hosted by Queen Elizabeth II prior to the fopening ceremony of the London 2012 Olympic Games, Friday.