(AP Photo/Michael Probst)
(AP Photo/Michael Probst)

Chilling details are emerging behind what appears to have caused a Germanwings flight to crash into the mountains in the French Alps, killing everyone on board.

Fox News Radio's Simon Owen has more from London.

The local prosecutor, Brice Robin, saying analysis of the recorder has revealed normal conversations between the pilot and co-pilot as the flight began.

Then, the pilot leaves the cockpit -- perhaps to use the bathroom -- and the co-pilot refuses to let him back in. Even as he pounds on the door.

Prosuecutors saying the co-pilot appears to be conscious and breathing normally -- as he puts the jet into a descent. And he doesn't say a word for the rest of the recording.

(AP Photo/Michael Probst)
(AP Photo/Michael Probst)

He's been named as 28-year-old Andreas Lubitz, with the airline Germanwings for about 18 months. Prosecutors saying he's not known to have links to any terrorist group. 

In London, Simon Owen, FOX News Radio. 

(AP Photo/Laurent Cipriani)
(AP Photo/Laurent Cipriani)

More details of what may have caused a Germanwings flight to crash into a mountain in the French Alps are being released... and the implications are chilling.

More from FOX News Radio's Simon Owen:

(Copyright , The Associated Press)
(Copyright , The Associated Press)

The Germanwings plane crash increasingly looking like a deliberate act.

French Prosecutor Brice Robin (translated) says the decent began after the pilot left the cockpit and the co-pilot was in control:

Prosecutor Brice Robin (translated) says the co-pilot intentionally locked the pilot out of the cock-pit, forcing the plane into decent:

French Prosecutor Brice Robin (translated) confirming to the media that the Germanwings' pilot did in fact leave the plane's cockpit before the fatal crash:

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**Editors Note: Watch for Dating/Developments.**