France is in mourning after three national sports personalities were among 10 people killed in a double helicopter crash during the filming of a reality TV show in northwestern Argentina. Two Olympic medal winners — the 28-year-old boxer Alexis Vastine and 25-year-old swimmer Camille Muffat — and yachtswoman Florence Arthaud, 57, lost their lives in La Rioja province on Monday. Five other French nationals and two Argentinian pilots also died.