HAVANA, July 7- The possibility that the Cuban rebels are demanding “belligerent status” in return for the release of the kidnaped United States sailors and marines is envisaged here.
 Rebel sources say naval personnel will be held until it is possible for their high command to talk with Ambassador Earl E. T. Smith or an official of the United States State Department.
 A report circulated in Havana that the rebels hoped to obtain belligerent status from at least four Latin American countries within the near future.
 Five persons were killed and four wounded when a Cuban Navy plane exploded and burned in a forced landing at Preston sugar mill of the United Fruit Company in Oriente Province this afternoon, a communique from the navy base said.