The sources in the space industry have previously suggested this version to Sputnik, but it has not been officially confirmed.
READ MORE: Russian Investigators Identify Responsible for Failed Soyuz Launch — Source
"The cause was malfunctioning of the detector that flags separation the first and second stages," Krikalev said at the Russian Academy of Sciences.
On October 11, a Soyuz-FG launch vehicle failed to take the Soyuz MS-10 spacecraft with the new crew of the International Space Station into space. This became the first failure of a manned space launch in modern Russian history.
Russian cosmonaut Alexey Ovchinin and NASA astronaut Nick Hague managed to eject in a rescue capsule and make an emergency landing in Kazakhstan unharmed.