The investigation in a Tupolev Tu-154 plane crash that happened at the Sochi airport on 25 December 2016 continues in accordance with Russian laws.
156 people have been recognized as injured parties.
More than 100 witnesses, including officials of the Aerospace Forces and the Sochi international airport responsible for getting the plane ready for the flight and for flight control, are being questioned.
A forensic technical examination is being run involving experts.
Results of 356 forensic medical, 23 DNA, 3 blast technical and 1 phonographic tests have been received. A forensic chemical test of the fuel and lubricants used by the plane has been finished.
All the data received so far rule out an explosion aboard the plane.
All the injured parties are cooperative.
The preliminary investigation is controlled by the Chairman of the Investigative Committee.
Spokesperson for the Investigative Committee Svetlana Petrenko