Reports in Russia also say the Tupolev-154 aircraft, which is used mostly by government and military officials, has been grounded while investigations into the cause continue.

All 92 people on board the aircraft were killed in Sunday’s crash, with experts saying it is likely that pilot error or a technical fault were to blame.

Today is day of national mourning in Russia for the victims of #Tu154 crash. Flag flying half-mast at the Embassy. pic.twitter.com/DajSAMaZTp

— Russian Embassy, UK (@RussianEmbassy) 26 dicembre 2016

Many of the victims were dancers and members of the Red Army Choir, heading to Syria to entertain Russian troops.

The plane is thought to have several flight recorders and a second one is also reported to have been located by search and rescue teams.

The remains of many of the victims are slowly being recovered from the sea. (Seamus Kearney - Euronews)

We will miss the victims of #Tu154 #RA85572 crash. These brave and talented people will never be forgotten. May their souls rest in peace. pic.twitter.com/SajrgSY79T

— РоссиЯ ?? (@Russia) 25 dicembre 2016