Egyptian Prime Minister Sherif Ismail said there was no "distress call" from the missing EgyptAir flight, but a "signal" was received from the plane.
The Egyptian army denied reports that it received a distress call from the plane.
It came after the Egyptian Civil Aviation Ministry said a military unit picked up a distress call.
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.