The Russian defense ministry has announced that rescuers have found the second black box from the military aircraft that crashed into the Black Sea at the weekend.

The discovery comes a day after the primary in-flight recorder was found which could give investigators vital clues as to the cause of the fatal crash. The defense ministry also said that 15 bodies and 239 body parts have been found, with some being sent to Moscow for DNA identification.

The Soviet-era Tu-154 aircraft with 92 people on board went down off the coast of the southern city of Sochi shortly after take-off on Christmas Day.