An Indonesian official says the cockpit voice recorder of the Lion Air jet that crashed into the Java Sea in October has been found.

Egypt said Thursday it has recovered the cockpit voice recorder from the submerged wreckage of EgyptAir Flight 804, a major breakthrough in the investigation that could help resolve the mystery of why the jetliner plunged into the Mediterranean last month and killed all 66 people aboard.

According to the Associated Press, the crash of Flight 9525 appears to be intentional.