Alton Towers crash caused by 'human error'
An investigation found that the safety control system was manually overridden, and the proper protocols were not followed. In total, 16 people were injured on the Smiler ride, when it crashed into an empty carriage that had stopped on the tracks.
"A ride shutdown message was misunderstood by staff at the ride," an Alton Towers spokeswoman said.
"This led to a decision to manually restart the ride, overriding the control system without appropriate safety protocols being followed correctly."
Merlin Entertainment, who own Alton Towers, have previously said that the injured parties will be receiving compensation.