Several NASA management personnel lost their professional heads as a result of the investigation. The air temperature was too cold for launch, but they were in a hurry. The silicone O ring seals holding the solid rocket segments together became stiff due to the cold and could not do their job. live propellant burned through a gap and then the main fuel tank.
I know a lot about this. The solid rocket booster propellant was a Hydroxyl Terminated Poly Butadine (HYPB) and aluminum dust type of propellant that had been shown to be unstable at low temperature from an accident rocket motor explosion that I worked on myself. It turned out that this explosion was not the same cause that I worked on, but the risk was known.