The Russian Investigative Committee has announced the main versions of what caused the tragedy.
"The investigation is considering various versions for the cause of the incident, among which are the insufficient qualification of pilots, dispatchers and technical inspectors of the plane, as well as aircraft malfunction and adverse weather conditions", the committee said.
Previously, a source with the emergency services told Sputnik that both of the SSJ-100's black boxes had been discovered at the site of a crash in Sheremetyevo Airport.
"Both black boxes — a flight data recorder and a voice recorder — were found and dismantled", the source stated, adding that investigators were studying the find at the moment.
A commission has been created to probe the cause and circumstances of the accident.