LONDON, June 12, 2016 (Xinhua) -- London Mayor Sadiq Khan poses for pictures as he participates in celebrations for Queen Elizabeth II's official 90th birthday at Trafalgar Square in London, June 12, 2016. (Xinhua/Ray Tang)
LONDON, June 12, 2016 (Xinhua) -- London Mayor Sadiq Khan poses for pictures as he participates in celebrations for Queen Elizabeth II's official 90th birthday at Trafalgar Square in London, June 12, 2016. (Xinhua/Ray Tang)