Search teams have suffered a setback in their hunt off Jamaica's coast for a small plane that crashed after a mysterious "ghost" flight.
They said they could no longer see debris spotted earlier which could have been wreckage from the single-engine turboprop Socata TBM-700.
A military jet had sighted floating objects which were photographed from the air, but it was unable to confirm if it was definitely the crash site.
Flares were deployed, however by the time rescuers reached the area there was no sign of the debris.
The search is continuing for the aircraftThe seven-seater Socata plane had slammed into the sea on Friday when it ran out of fuel around 14 miles off Jamaica's northeast coastline, according to officials.
American real estate entrepreneur Larry Glazer and his wife Jane, both experienced pilots, were killed in the crash, said officials from the town of Rochester, New York.
Their plane had flown over Cuba and across the Caribbean, ignoring calls from air traffic control, as it went on a ghostly 1,700-mile journey after the pilot was apparently incapacitated.
Laurence and Jane Glazer. Pic: WXXI television stationUS fighter pilots following the unresponsive aircraft saw the pilot was "unconscious and slumped over" and the windows were frosting up, indicating a loss of oxygen.
The jets were forced to break off as the Socata continued south from Florida over Cuban airspace for another four hours.
Jamaica Coast Guard Commander Antonette Wemyss-Gorman said the debris had been spotted in the same location - about 24 miles from the town of Port Antonio - where crews had noticed an oil slick.
The aircraft flew over Cuban airspace. Pic: FlightAware.com"Unfortunately, we were not able to recover any of this debris," she said. "We would have to assume it may have sunk."
The plane had taken off at 8:45am on Friday from Greater Rochester International Airport in New York en route to Naples, Florida.
The pilot had indicated there was a problem and twice asked to descend to a lower altitude before permission was granted by an air traffic controller, according to a recording of the radio conversation.
The plane crashed in waters off JamaicaRadio contact was lost a short time later.
The area where the private French-made plane went down has depths of up to 2,000 metres (over 6,500ft).
Leroy Lindsay, director general of Jamaica's civil aviation authority, said French authorities have volunteered to provide help to bring wreckage up from the ocean depths when it is found.