MOSCOW (AP) Search teams on Wednesday recovered another flight recorder from a military plane that crashed in the Black Sea, killing all 92 people aboard, the Defense Ministry said. The first flight recorder was found the previous day and experts have started analyzing its data, seeking to identify the cause of the crash. The Tu-154 of the Russian Defense Ministry crashed into the sea early Sunday, two minutes after taking off in good weather from the city of Sochi. It was carrying members of the Alexandrov Ensemble, widely known as the Red Army Choir, to a New Year's concert at a Russian military base in Syria. The Defense Ministry said 15 bodies and 239 body fragments have been recovered from the crash site. It previously said 17 bodies had been found. A massive recovery effort has involved 3,600 people, including about 200 navy divers flown to the site from all over Russia. They have been aided by drones and submersibles. Investigators were looking into whether the crash might have been caused by bad fuel, pilot error, equipment failure or objects stuck in the engines. The top Russian investigative agency said it had taken samples from a fuel tank used to fill the plane, which flew from Moscow's Chkalovsky military airport and stopped in Sochi for refueling.