MARSEILLE, France (CNN) — Police investigators have left the site in the French Alps where Germanwings Flight 9525 crashed, a French national police official told CNN on Saturday, though the work of determining exactly what happened and what can be done about it continues.
It was not immediately clear when or if investigators might return to the site, which is in rugged, mountainous terrain about 6 miles (10 kilometers) from the French town of Seyne-les-Alpes.
“There is only a private security company ensuring … that no one can go there,” said Capt. Yves Naffrechoux of the French Gendarmerie.
The investigators departure comes after a flight data recorder, or “black box,” was found Thursday by a member of the recovery team. The cockpit voice recorder was found days after the March 24 crash, which killed all 150 people onboard.
Authorities say the flight’s co-pilot, Andreas Lubitz, locked the pilot out of the cockpit and engineered the plane’s demise.
Initial tests on the flight data recorder show that Lubitz purposely used the controls to speed up the plane’s descent, according to the French air accident investigation agency, the BEA.
It has also emerged that Lubitz had battled depression years before he took the controls of Flight 9525 and that he had concealed from his employer recent medical leave notes saying he was unfit for work.