As Russia today began observing a national day of mourning for 92 people killed in a military plane crash, authorities revealed that many key members of Russia's official armed forces musical ensemble were among the dead, according to Russian media outlets.

Russian State Secretary and Deputy Defense Minister Nikolai Pankov confirmed that 68 members and staff of the Aleksandrov Ensemble – including choir conductor Valery Khalilov -- were killed early on December 25 when the Tu-154 aircraft crashed into the Black Sea shortly after taking off from Sochi. There were no survivors.

The 33-year-old plane was meant to travel to Russia’s Hmeimim military airbase near Latakia, Syria where the Aleksandrov Ensemble was to perform a New Year’s concert for Russian airmen.

Pankov said in Moscow early on December 26 that “the ensemble will live” and that “the ensemble will continue to remain a symbol of the army and our country.”

In Moscow, mourners early on December 26 were continuing to lay flowers and light candles in front of a Moscow concert hall where the ensemble often performed.

Also aboard the ill-fated plane were eight crew members, six other military personnel, nine Russian television journalists, and Elizaveta Petrovna Glinka, a human rights activist and executive director of the Spravedlivaya Pomoshch (Fair Aid) charity fund.

Glinka reportedly was traveling to Syria to deliver medical supplies to Tishrin University Hospital in Latakia.

The state-run TV stations First Channel, NTV, and Zvezda said they each had three staff onboard the flight.

Fragments of the plane were discovered less than two kilometers off the coast of Sochi at depths of 50 to 70 meters.

By early December 26, only 11 bodies of crash victims had been found and a large-scale search and rescue operation also was looking for the black box containing the plane's cockpit flight data.

The Kremlin says President Putin ordered Prime Minister Dmitry Medvedev to form and head a state commission to investigate the crash.

Russian Transport Minister Maxim Sokolov, who also is on the investigative commission, said authorities were looking into every possible reason for the crash.

But he said officials have ruled out terrorism.

Deputy Defense Minister Pavel Popov flew into Sochi on December 25 along with a team tasked with clarifying the circumstances surrounding the crash.

In remarks carried by the state news agency RIA Novosti, Ozerov -- without citing any source -- said the crash could have been caused by a technical malfunction or a crew error, but he believes it could not have been terrorism because the plane was operated by the military.

The Interfax news agency cited an unnamed source as saying the plane had not sent an SOS signal.

Kremlin spokesman Dmitry Peskov told reporters it was too early to say what had caused the crash.

The flight originated in the capital, Moscow, and had a stopover in Sochi for refueling.  The plane was headed to the Russian Hmeymim airbase in Latakia, Syria, where Russia has a large military presence, for a concert ahead of New Year's Eve, a source told Russia's state news agency TASS.

The Tu-154 is a Soviet-era plane which has a checkered past in terms of accidents. The plane, which has not been in commercial use since 1994, is still used by the military.