Investigators have seized repair documentation on TU-154 military plane crashed into the Black Sea near Sochi from the Russian Aviacor manufacturer, RIA Novosti reported Monday.

Collection of engineering document information is a standard procedure in such cases. The plant has submitted all proper documents to investigators, according to the statement of Russian Machines holding, which owns Aviacor aviation plant.

The plane, which was carrying out a planned flight to Syria with 8 crew members and 84 passengers on board including journalists, musicians from the famous Alexandrov military ensemble and Elizaveta Glinka, widely known as Doctor Liza, the Fair Aid charity executive director and the inaugural winner of Russia's state prize for achievements in human rights, crashed into the Black Sea on December 25. The aircraft refueled at Adler’s airport and shortly after disappeared from radars.

As Major General Igor Konashenkov, the Defense Ministry’s spokesman, told journalists, no one survived in the crash.

Searches for the crash site are being conducted by rescue services of the Defense Ministry and Ministry of Emergency Situations. Investigative measures are currently underway.