BERLIN, March 30. /TASS/. The co-pilot of the Germanwings Airbus that crashed in the French Alps on Tuesday had been treated for "suicidal tendencies" before obtaining his pilot’s license, the office of the German prosecutor in Dusseldorf said on Monday.

Andreas Lubitz was treated by psychotherapists and had "suicidal tendencies" before he even started his pilot training. However, the prosecutor office said there were no indicators Lubitz was considering suicide during his last visits to the doctor.

The motives of German pilot Andreas Lubitz for crashing a Germanwings Airbus, killing all 150 people onboard, remain unclear.

Investigators are considering different theories, including terrorism, epileptic seizure and suicide. Data retrieved from the black box suggest the pilot was calmly breathing at the moment when the plane skydived at 700 km/h.

Marseille Prosecutor Brice Robin said last week that data from the block box suggest that the co-pilot deliberately crashed Flight 9525. He locked the captain out of the cockpit and started descent.

A Germanwings Airbus-320 en route from Barcelona to Dusseldorf crashed on March 24 in mountainous terrain in the department of Alpes-de-Haute-Provence, southern France. All 150 people onboard, including 144 passengers and six crew, died in the crash.