A French government minister has reversed earlier claims that a "black box" recorder from a plane that crashed in the Indian Ocean has been found, BBC reported.
French Minister for Co-operation Alain Joyandet said signals picked up by rescuers came from a distress beacon.
Earlier, an official said efforts to retrieve one of the black box recorders would begin during the day.
The plane, flying from the Yemeni capital Sanaa to the Comoros, came down in bad weather with 153 on board.
Meanwhile doctors say the only survivor of the crash, teenage girl Baya Bakari, is recovering and in no danger.
There were 66 French nationals among the passengers. Most of the rest were Comorans.
Most of the passengers had flown on a different Yemenia aircraft from Paris or Marseille before boarding flight IY626 in Sanaa.
Most aircraft have a flight data recorder and a cockpit voice recorder.
"The Transall (military plane) that picked up an acoustic signal did not, despite what was said this morning, detect the beacons of the flight recorders, but rather what appear to be its distress beacons," Mr Joyandet said in Moroni, the Comoros capital, AFP news agency reported.