Investigators have downloaded data from one of the black box flight recorders on EgyptAir Flight MS804 and are preparing to analyze it, bringing them closer discovering what caused the jet to crash, Egypt's investigation committee said on Wednesday, June 29, accoridng to Reuters.

The Airbus A320 plunged into the eastern Mediterranean Sea en route from Paris to Cairo on May 19, killing all 66 people on board. The cause of the crash remains unknown.

"Preliminary information shows that the entire flight is recorded on the FDR since its takeoff from Charles de Gaulle airport until the recording stopped at an altitude of 37,000 feet where the accident occurred," Egypt's Aircraft Accident Investigation Committee said in a statement.

Search teams have salvaged both of the so-called black box flight recorders. Investigators are now preparing to analyze data from the flight data recorder.

"Recorded data is showing consistency with SCARS messages of lavatory and avionics smoke," the committee said, referring to the Aircraft Communications Addressing and Reporting System, which routinely downloads maintenance and fault data to the airline operator.

The plane had sent a series of warnings indicating that smoke had been detected on board through SCARS.

Recovered wreckage from the jet's front section showed signs of high temperature damage and soot, the committee said. Those were the first physical signs that fire may have broken out on the A320 airliner, in addition to maintenance messages indicating smoke alarms in the avionics area and lavatory.

The committee said these findings would need further analysis to discover the source and reason for the marks, however.