The co-pilot of Germanwings Flight 9525 appears to have deliberately crashed the plane after he was left alone in the cockpit, according to a French prosecutor.

The captain was intentionally locked outside minutes before the A320 crashed into an alpine mountain ridge, French Prosecutor Brice Robin said Thursday. Co-pilot Andreas Lubitz, a 27-year-old German national, was silent throughout the plane’s descent and was alive at the point of impact, according to the prosecutor.

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