A Russian military plane with 92 people on board, including members of the world-famous Russian army choir, crashed into the Black Sea early Sunday morning shortly after taking off from Sochi.
There appeared to be no survivors. Russian President Vladimir Putin declared Monday to be a national day of mourning.
The choir was headed to a New Year's concert in the Hemeimeem air base in Latakia, Syria.
Losing a great collective all at once is a great tragedy.
Alexander Kibovsky, Moscow's culture dept. head
Viktor Ozerov, head of the defense 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 "totally excluded" the chance an attack brought down the plane.
Nationally known charity doctor Yelizaveta Glinka was also on board.
WATCH | The Red Army Choir MVD sang Daft Punk's "Get Lucky" at the opening of the 2014 Sochi Winter Olympics.
More on the plane
The 84 passengers and eight crew members were in a Russian Tu-154 plane, an older model that is still popular among military and government agencies for its mobility and durability. The plane involved in the crash was built in 1983 and repaired in 2014.
Here's a look at the memorial service held for the choir and the scene of the investigation.