French authorities say they have managed to extract a 'useable' audio file from the black box recovered following yesterday's air crash in the Alps.
150 people died when the Germanwings plane from Barcelona to Dusseldorf plummeted to the ground.
Investigators say it will take some time to decipher an analyse the black box recordings.
This French aviation authority spokesman Remi Jouty says it could take weeks or months before they know precisely what happened.
