https://phys.org/news/2018-10-russia-blames-rocket-failure-technical.html > Roscosmos' executive director Sergei Krikalyov said Wednesday the probe found that a malfunction of a sensor which signals the jettisoning one of the rocket's four side boosters caused the booster to collide with the second stage of the rocket. Explore further: Russian rocket puts satellite into orbit, 1st since failure > © 2018 The Associated Press. All rights reserved.