'No survivors' as Syria-bound Russian jet crashes

The Russian defence ministry said there was no sign of survivors at the site where a military plane travelling to Syria crashed in the Black Sea on Sunday, local news agencies reported.

"The site of the Tu-154 plane crash has been identified," news agencies quoted the ministry as saying, adding that four bodies had been recovered from the water.

"There is no sign of survivors."

The Tu-154 plane crashed in the Black Sea shortly after taking off from the southern city of Adler where it had been refuelling, defence ministry spokesperson Igor Konashenkov told Russian news agencies.

It disappeared from radars just two minutes after it took off at 5:25 am (0225 GMT).

The ministry told agencies there was no sign of any survivors at the crash site and that four bodies had been recovered off the coast of the resort city of Sochi, after authorities launched a frantic search operation.

"Fragments of the Tu-154 plane of the Russian defence ministry were found 1.5 kilometres from the Black Sea coast of the city of Sochi at a depth of 50 to 70 metres," the ministry said.

President Vladimir Putin, who declared Monday a national mourning day, has ordered Prime Minister Dmitry Medvedev to head a government commission to investigate the crash.

The plane had been on a routine flight to Russia's Hmeimim airbase in western Syria, which has been used to launch airstrikes in Moscow's military campaign supporting its ally President Bashar al-Assad in the country's devastating civil war.

Among the plane's 84 passengers were Russian servicemen as well as 64 members of the Alexandrov Ensemble, the army's official musical group also known as the Red Army Choir, and its conductor Valery Khalilov.

They were heading to Syria to participate in New Year celebrations at the airbase.

Nine journalists were among the passengers, with state-run channels Pervy Kanal, NTV and Zvezda saying they each had three staff onboard the flight.

There were also eight crew members onboard, the ministry said.

A list of passengers published by the defence ministry also included Elizaveta Glinka, a doctor and charity worker who serves on the Kremlin human rights council.

Mikhail Fedotov, who heads the council, said Glinka was travelling to Syria to bring medication to a university hospital in the coastal city of Latakia near the airbase, agencies reported.

Terrorist attack 'excluded'

Viktor Ozerov, head of the defence affairs committee at the upper house of Russian parliament, 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.

"I totally exclude" the idea of an attack bringing down the plane, he said in remarks carried by state RIA Novosti news agency.

Kremlin spokesperson Dmitry Peskov had told news agencies that Putin was being kept updated on the search operation.

"It's too early to say anything," agencies quoted Peskov as saying, adding that Putin was in constant contact with Defence Minister Sergei Shoigu.

"The president is waiting for the picture to be clear."

Konashenkov said that Deputy Defence Minister Pavel Popov had flown to Adler along with a team tasked with clarifying the circumstances surrounding the crash.

Russia's Investigative Committee said a criminal probe had been launched to determine whether violations of air transportation safety had led to the crash.

Investigators are currently questioning the technical personnel responsible for preparing the plane for take-off, the committee said.

Tu-154 aircraft have been involved in a number of accidents in the past. 

In April 2010, many high-ranking Polish officials, including then president Lech Kaczynski, were killed when a Tu-154 airliner went down in thick fog while approaching the Smolensk airport in western Russia.

Moscow has been conducting a bombing campaign in Syria in support of Assad since September 2015 and has taken steps to boost its presence in the country.

In October, Putin approved a law ratifying Moscow's deal with Damascus to deploy its forces in the country indefinitely, firming up Russia's long-term presence in Syria.