One of the black boxes from an Airbus A320 plane that crashed into the Mediterranean Sea Thursday has been recovered, according to dpa. The district attorney's office in the coastal city of Perpignan reported that the black box with recordings of the pilots' conversations and cockpit noises has been recovered. A second black box with the flight data recorder has also been located. Authorities hope to use data from the boxes to determine the cause of the crash. To date, there are no indications as to the cause of the crash. The plane, just three years old, went down as it was making its landing approach at Perpignan after a two-hour test flight. There had been no distress signal beforehand, and moments before, air traffic controllers had held normal communications with the cockpit crew. Eyewitnesses spoke how the plane suddenly climbed steeply, only then to plunge like a rock into the 40-metres-deep waters. Weather conditions were good, but temperatures were cold, leading to speculation about whether the plane's wings or rudder had suddenly iced up. Recovery crews spent Saturday finding countless small pieces of wreckage. Two bodies have been recovered from the plane. There has, so far, been no sign of the remains of five others known to be aboard the plane when it crashed.