Russian cosmonaut Aleksei Ovchinin and USA astronaut Nick Hague returned to Earth in their Soyuz capsule for an emergency landing following a problem with the booster rocket shortly after a launch bound for the International Space Station (ISS), RFE/RL reported.
The crew landed in the fields of Kazakhstan about 25 kilometers from the city of Dzhezkazgan (a little more than 400 kilometers from Baikonur).
The Russian space agency says it is taking preventive measures to guard against future failures and to get Soyuz back into space.
When the planned separation occurs, two of the three visible portions of the previous stage fall off and away from the spacecraft as they should, but the one on the left side of the video hangs on for an extra moment, tumbling towards the rocket rather than away from it.
Igor Skorobogatov, who headed the inquiry, said on Thursday that the issue was linked to the "deformation" of a sensor part.
After the successful emergency landing both the Russian and USA space agencies praised the Soviet-designed rocket, with Nasa administrator Jim Bridenstine saying last month that USA astronauts will continue using the Soyuz and praising its "resilience".
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The rocket producer will also take apart two other rockets which have been recently assembled and are due to launch in the coming weeks and then reassemble them, Skorogobatov said.
The other was now in Kourou, a space port in French Guiana which Russian Federation uses for commercial launches of satellites, he added.
Russian officials believe that the defective component was damaged during assembly.
"We have to draw conclusions from every emergency situation", said Roscosmos deputy director Alexander Lopatin, adding that Russian Federation has discussed the findings of the probe with Nasa.
"It has been proven and supported by the documented evidence that the sensor [failure] is to blame for the accident", said the the commission chief Oleg Skorobogatov.
The crew is set to include Canadian astronaut David Saint-Jacques, who was originally scheduled to fly to the station December 20 on a six-month mission.