PARIS (AP) — French investigators have identified body parts from all 150 people aboard the Germanwings flight that crashed more than a week ago, a prosecutor said Thursday.

Investigators have found and studied 2,854 body parts, Marseille Prosecutor Brice Robin said.

But he said it will still take a long time for investigators to match the body parts with DNA samples from families of the victims.

Robin also gave details about the discovery of the second black box. He said it was found by a gendarme buried on the left side of a ravine "already explored several times."

He described the flight data recorder as "completely blackened" as though it had been burned, but said it was "possibly usable."

Robin said 40 cellphones had been found at that crash site in a "very, very damaged" condition, without referring to the reports by Paris Match and Bild that footage of the final moments of the crash had been recovered.

In Germany, prosecutors said the co-pilot of Germanwings Flight 9525 appears to have researched suicide methods and cockpit door security in the days before he crashed the plane into the French Alps, killing everyone aboard.

Search terms found on a tablet computer at co-pilot Andreas Lubitz's apartment in Duesseldorf provided the first evidence that his actions may have been premeditated.

Based on information from the cockpit voice recorder, investigators believe Lubitz, 27, locked his captain out of the Airbus A320 cockpit on March 24 and deliberately slammed the plane into a French mountain.