Search teams have retrieved the cockpit voice and flight data recorders from the EgyptAir plane which crashed into the Mediterranean in May, killing all 66 on board.
It is hoped analysis of the black boxes will shed light on why the plane crashed en route from Paris to Alexandria.
At present no militant group has claimed responsibility for bringing down the aircraft.
Smoke was detected in a bathroom near the cockpit of the doomed EgyptAir flight MS804 before it fell off radar, reports claim.
According to aviation industry website AVHerald.com, data transmissions from the Aircraft Communications Addressing and Reporting (ACARS) system suggest a fire on board the jet.
Messages in the final few minutes of the flight read:
'FCU' refers to a unit in the cockpit which the pilot uses to input instructions into the flight computer, while 'SEC 3' is the computer which controls the spoilers and elevator computers.
NBC News, citing US intelligence sources, said officials have "no reason" to believe the messages are not accurate.
CNN said an Egyptian source had shown them a screengrab of the recordings.
Sixty-six people were on board the plane when it came down over the Mediterranean.
Work has begun on analysing data from the two black boxes from the fated EgyptAir flight that crashed into the sea in May.
French air accident investigators confirm the signal detected earlier is from a flight recorder.
The head of Egypt's forensics authority said it is 'too early' to know what caused the EgyptAir plane to crash into the Mediterranean sea.