Prosecutor: Co-pilot 'intentionally' crashed Germanwings plane in French Alps

The French prosecutor said the pilot was locked out of the cockpit. Banging on the cockpit door could later be heard on the voice recorder.

Laurent Cipriani/AP

The co-pilot of a Germanwings flight that slammed into an Alpine mountainside "intentionally" sent the plane into its doomed descent, a French prosecutor said Thursday.