An out-of-control monster truck careered into a crowd of spectators in Mexico, killing at least eight people and injuring 80 others. Witnesses said the driver appeared to have hit his head moments before driving into the crowd. Watch the horror crash!CHIHUAHUA, Mexico – A monster truck drove into a crowd of spectators at a Mexican air show in October 2013, killing at least eight people and injuring 80 others, officials said.Carlos Gonzalez, spokesman for the Chihuahua state prosecutors' office, said the driver appeared to have lost control of the truck after leaping over cars during a demonstration at the Extreme Aeroshow on October 5 2013.Video: Deadly monster truck crash kills 8In a video posted by a spectator, the truck can be seen making an initial pass over two cars, then making a second pass at higher speed, before bouncing violently and driving into the crowd. The spectators stood stood in the path of the truck, unprotected by any barrier.AT LEAST ONE CHILD KILLEDWitnesses said the driver appeared to have hit his head as he drove over cars, with at least two reportedly seeing his helmet come off before the crash.Spectator Jesus Manuel Ibarra, who was treated for injuries to his arm and hip, said: "I fell over, and when I turned around I saw the tyre very close to me. It hit and threw me to the other side of the truck.”Gonzalez said the crash killed at least one child and hurt 80 people, 46 of whom remained in hospital. He said the number of dead and injured could rise as officials received updated information.‘HIS HELMET FLEW OFF’Gonzalez said prosecutors believed the cause of the crash could be a mechanical failure that left the driver unable to release the accelerator. Several witnesses said that the driver appeared to have become incapacitated when he struck his head moments before driving into the crowd. Spectator Daniel Dominguez said: "The driver hit his head and his helmet flew off. The truck came directly at us."His 11-year-old sister was in surgery for injuries to her legs and his mother was treated for minor contusions.