BOGOTA, Colombia (AP) _ A small plane with at least five Americans on board crash-landed Thursday in rebel territory in southern Colombia, a Colombian aviation official said.

A Colombian aviation official, speaking on condition of anonymity, said the Cessna Caravan had been headed from Bogota to the Florencia area, 235 miles (380 kilometers) to the south, when radio contact was lost eight minutes before its scheduled landing.

The U.S. Embassy said it is ``investigating the disappearance of a U.S. government aircraft.''

``We are working to ascertain the facts around the disappearance,'' a U.S. Embassy spokesman told The Associated Press. The official said various reports were coming in and that it would not be prudent to comment until they are checked out.