A French naval vessel has reportedly detected underwater signals from EgyptAir Flight 804's black boxes, on Wednesday, according to Egyptian investigation committee.

Specialized locator equipments on the La Place, the French vessel detected signals from the sea bed of Mediterranean Sea, according to reports from CNN.

The director of BEA, the air accident investigation agency of France, later mentioned that the vessel has confirmed that the signals were from one of the recorders on the plane.

"The signal of a beacon from a flight recorder could be detected. ... The detection of this signal is a first step," BEA Director Remy Jouty said in a statement.

A few hours later, the French military's high command said on Twitter: "The search vessel Laplace has detected a beacon from one flight recorder."

The detection of the signal was confirmed by Sebastian Barthe, a spokesperson for the French agency, which investigates aviation accidents, which is cooperating with Egyptian officials on the inquiry.

Notably, the Airbus A320, which had 66 people abroad, crashed in the Mediterranean Sea on May 19, while going from Paris to Cairo.

Since then, the concerned authorities have been searching for wreckage and remains of the plane, along with its flight data and cockpit voice recorders, which could provide evidence and the reason of the crash.

The search for the EgyptAir plane has now been narrowed to an area within a three-mile radius in the Mediterranean Sea, where the satellite data indicate the plane probably went down. The area is situated 180 miles north of the Egyptian coast, according to Los Angeles Times.

Till now, no terrorist group has claimed responsibility, though the Egyptian Aviation Minister, Sheriff Fathy, has mentioned that terrorism is a more likely cause of the crash rather than technical failure. This has also added to the mystery of the crash.