He also hid the fact that he'd been excused by a doctor from work the day he crashed the passenger plane in the French Alps, killing all 150 passengers on board.

Torn-up sick notes "support the current preliminary assessment that the deceased hid his illness from his employer and colleagues," prosecutor's spokesman Ralf Herrenbrueck said in a statement.

Still, Herrenbrueck said no suicide note was found and that there was no sign of any political or religious motivation for Lubitz's actions.

The new information surfaced as German officials work to figure out the 28-year-old's motives.

So far, they've learned Lubitz began his flight training in 2008, part of it in the United States at a flight center near Phoenix.

Meanwhile, the tragedy is causing several international airlines to make changes to match U.S. policy, which requires two in the cockpit at all times.

Airlines are also questioning the idea of an impenetrable cockpit door.

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