Monster truck loses control and drives into audience Thirteen people were killed and more than 70 injured when a monster truck driver lost control and drove into an audience in Chihuahua, Mexico Witnesses say they saw the driver hit his head on the inside of his truck before driving into the audience Authorities are also investigating whether a mechanical error might have happened, causing the gas pedal to stick A monster truck that drove off course and into an audience at a show in Mexico yesterday has killed 13 and injured more than 70. The incident happened at the 'Extreme Aeroshow' in Chihuahua, Mexico yesterday. The monster truck was leaping over a pile of cars when the driver seemed to lose control of vehicle and it drove straight into the audience attempting to flee. Out of bounds: At the 'Extreme Aeroshow' in Chihuahua, Mexico yesterday, a monster truck driver lost control of his vehicle and drove into a crowd of spectators Body count: Six people died on the scene, and another three died while receiving medical attention. Authorities found another four bodies while clearing the scene Witnesses say they saw the truck driver lose control of the vehicle after hitting his head on the inside of the truck. 'The driver hit his head and his helmet flew off,' recalled spectator Daniel Dominguez, 18. Dominguez's 11-year-old sister was taken into surgery for injuries to her legs, and his mother was also treated for minor contusions. 41-year-old Jesus Manuel Ibarra was hurt in his arm and hip. I fell over, and when I turned around I saw the tire very close. It hit me and threw me to the other side,' he said. Path of destruction: Initially, the mayor of Chihuahua announced that 47 people had been injured in the accident, but that number has now grown to more than 70 Locked in: Authorities are also investigating whether a mechanical error might have happened with the truck, causing the gas pedal to remain engaged Authorities are also investigating whether a mechanical error might have occurred, causing the gas pedal to remain engaged. Six people were killed at the scene of the truck show Saturday, and another three people died receiving medical attention. Later, four more bodies were found under the monster truck's wheels. Marco Quezada, the mayor of Chihuahua, initially said 47 were injured but that number has grow to 70. The monster truck driver survived the incident and has been arrested. After the accident, the air show was cancelled. It was the second day of the three-day show. In custody: The monster truck driver survived the crash and was arrested on the scene Over: The airshow was cancelled after the accident Medical attention: An injured spectator being airlifted out of the monster truck show yesterday