A second flight recorder with information on crashed EgyptAir Flight MS804 has been retrieved, Egyptian investigators said on Friday.

An Egyptian committee investigating last month's crash into the eastern Mediterranean Sea made the announcement a day after search teams found the cockpit voice recorder in a breakthrough for investigators seeking to explain what caused the plane to go down, killing all 66 people on board.

Two specialist vessels, one of them the John Lethbridge, have been looking for the black boxes. Photo: AFP

The Airbus A320 crashed into the Mediterranean early on May 19 on its way from Paris to Cairo.

The two blackbox recorders are crucial to explaining what went wrong.

Two specialist vessels, John Lethbridge and Laplace, had been searching for the flight data recorders.

The Egyptian investigation committee said preparations were under way to transfer the two flight recorders to Alexandria where they will be received by an official from the general prosecutor's office and investigators.