Reuters 2 minute read PORT-AU-PRINCE, July 3 (Reuters) - All six people on board a private plane, including two Americans missionaries, were killed when the aircraft crashed in Haiti, southwest of capital Port-au-Prince, according to media reports and a missionary group. The plane went down on Friday evening en route from an airport in Port-au-Prince to the southern coastal city of Jacmel, typically a short flight, reported the Miami Herald, citing a statement by the National Civil Aviation Office (NCAO). Reuters could not independently confirm the report. The cause of the crash was not immediately known. A Haitian government representative and the U.S. embassy did not immediately respond to a request for comment.