Britain's Prince Philip to retire from royal duties, Buckingham Palace announces

British Queen Elizabeth II (L) and Prince Philip the Duke of Edinburgh are seen on a carriage to Buckingham Palace during the Queen's 90th birthday celebrations in London, Britain in this file photo taken on June 11, 2016. British Queen Elizabeth II's husband, Prince Philip the Duke of Edinburgh, is to retire from royal duties this fall, Buckingham Palace announced here on May 4, 2017. (Xinhua/Han Yan)