 The section began with the Greek national anthem being played and raising of the flag ; followed by the Olympic anthem and the lowering of the flag . The Mayor of London , Boris Johnson , then handed the Olympic Flag to Jacques Rogge , who in turn passed it to Eduardo Paes , the Mayor of Rio de Janeiro . This was followed by the Brazilian national anthem and raising of the flag . The Olympic Flag was raised again in Sochi on 7 February 2014 at the opening ceremony of the 2014 Winter Olympics . 
