SOCHI, Russia — Rescue workers on Tuesday found a flight recorder from the Russian plane that crashed into the Black Sea over the weekend, the defense ministry said.

All 92 people aboard the Russian military's Tu-154 plane are believed to have died Sunday morning when it crashed two minutes after taking off from the southern Russian city of Sochi. The 84 passengers included dozens of singers from Russia's world-famous military choir who were going to the Russian Air Force base in Syria to perform at a New Year's concert.

Related: Minister: Pilot Error or Technical Problem Likely Cause of Jet Crash

The defense ministry said in a statement that one of the flight recorders was found early Tuesday morning about a mile away from the shore.

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State television showed footage of rescue workers on an inflatable boat carrying a container with a bright orange object submerged in water. The ministry said the "black box" would be immediately flown to Moscow. It did not mention whether any damage had been done to the flight recorder.

Rescuers lift a fragment of a plane in the Black Sea outside Sochi, Russia on Monday. AP

About 3,500 people, 45 ships and 192 divers have been sweeping a vast crash site for bodies of the victims and debris, and dozens of drones and several submersibles also have been involved in the search. Rescue teams so far have recovered 12 bodies and numerous body fragments, which have been flown to Moscow for identification.

Divers found fragments of the fuselage, parts of the engine and various mechanical parts at night, the defense ministry said.

Officials still have not announced the cause of the plane crash, but they have been anxious to squelch speculation that it might have been caused by a bomb planted on board or a portable air defense missile.

But some aviation experts have noted that the crew's failure to communicate any technical problem and a large area over which fragments of the plane were scattered point at a possible explosion on board.