Germanwings crash: Last moments of flight
24 March 2015 Last updated at 17:28 GMT
A Germanwings plane carrying 150 people has crashed in the French Alps on its way from Barcelona to Dusseldorf.
The Airbus A320 - flight 4U 9525 - went down between Digne and Barcelonnette. Officials say there are no survivors.
The BBC's Transport Correspondent Richard Westcott explains what we know so far.