Evidence gathered in the investigation of the crash of EgyptAir Flight 804 suggests the plane broke up in midair after a fire “near or inside the cockpit that quickly overwhelmed the crew,” according to Egyptian authorities, the New York Times reported on Friday. However, officials are still uncertain as to whether the fire broke out due to mechanical failure or a terrorist act. “Crew members were playing music and chatting amiably when the pilot, Capt. Muhammed Shoukair, 36, suddenly said there was a fire on board and asked the co-pilot, Muhammad Mamdouh Assem, 24, to get an extinguisher. That was the last human sound the recorder captured,” the NYT reports.