According to media sources and a missionary group, all six individuals on board a private plane, including two American missionaries, were killed when the plane crashed in Haiti, southwest of the capital Port-au-Prince.

The jet went down on Friday evening its route from a Port-au-Prince airport to Jacmel, a small seaside city in the south, according to the Miami Herald, citing a statement from the National Civil Aviation Office (NCAO). The report could not be independently verified by Reuters.

The cause of the crash remained unknown at the time.

A request for comment from the Haitian administration and the US Embassy was not immediately returned.

The U.S.-based organization Gospel to Haiti posted an announcement on its Facebook page that two of its group members, American citizens Trent Hostelter, 35, and John Miller, 43, were killed in the crash.

The identities of the other four passengers were not immediately released by officials.

Hostelter’s wife and three children had taken an earlier flight on a small plane. Because there wasn’t enough room on the flight, he stayed behind with Miller to catch the next plane, the group said.

“When the second plane failed to arrive, they were understandably concerned, and they soon learnt that the plane had crashed near Leogane. A search team was formed and sent out, and the jet was recovered early this morning, confirming that all six individuals on board had been slain “According to a Facebook post by the group.

Due to “unrest” in Port-au-Prince, where several factions fought each other or the police for control of the streets, displacing hundreds and exacerbating the country’s humanitarian crisis, Gospel to Haiti stated the party chose to fly on a small private plane.