The body of Kok's son was found late Friday in the wreckage of the helicopter which crashed in the river Dordogne in Gironde, while a Chinese interpreter was still missing, the report added. The cause of the crash was not immediately known. Helicopter crashes in southeastern France, casualties unknown PARIS, Dec. 20 (Xinhua) -- A helicopter with four people on board crashed on Friday in Gironde in southeastern France, local media reported. According to the reports, the former owner of the wine chateau of La Riviere and a Chinese investor who bought the 65 hectares of wines were among the passengers.