By Andrea Thomas

BERLIN--German Chancellor Angela Merkel said Thursday that she was deeply shocked by the news that the co-pilot of Germanwings Flight 9525 appears to have deliberately crashed the plane after locking himself alone inside the cockpit.

"Today, news has reached us that gives this tragedy a new, seemingly incomprehensible dimension," said Ms. Merkel. "I am hit by this news probably exactly as most people are. This is something that goes beyond any power of imagination. We don't yet know the full background and that's why it is and remains so important to continue with investigations until each aspect has been investigated thoroughly."

She reiterated the promise she made with the leaders of France and Spain on Wednesday that their governments would do everything they could to help throw light on all aspects of the crash in which 150 people died.

The co-pilot, identified as 28-year-old Andreas Lubitz, grew up in the German town of Montabaur.

French prosecutors said the pilot was intentionally locked outside cockpit minutes before the Airbus A320 crashed in the French Alps.

German Transport Minister Alexander Dobrindt said these findings are "plausible."

Write to Andrea Thomas at andrea.thomas@wsj.com

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