“We will know whether this was a bomb or whether it was a fire,” aviation analyst Richard Quest said. The second of the plane’s two black boxes , the cockpit voice recorder , remains in France for repair. The flight was at 37,000 feet when it lost contact above the Mediterranean and it’s supposed that the incident occurred at that moment. To this day, there has been no claim of responsibility by any terrorist organization. Crews are continuing to search for wreckage and the victims’ remains. The voice and flight data recorders, known as black boxes, were recovered from a depth of about 3,000m (9,800ft) in the Mediterranean. Some surface debris was found 290km (180 miles) north of the Egyptian city of Alexandria.