Tragedy struck a Chihuahua, Mexico, air show on Saturday as a monster truck hit a stand filled with spectators, killing at least eight and injuring 80, according to BBC.
CNN reports, as of Sunday, 28 people remained hospitalized and 12 are still in critical condition.
Kate Stanton of UPI.com notes that 4,000 people attended the "Extremo Aeroshow," which was held at the El Rejon dam on the outskirts of Chihuahua, about 230 miles south of Mexico-U.S. border.
There are a few possibilities regarding the circumstances surrounding the accident. The driver of the truck lost control as he was crushing two cars, according to BBC, so mechanical failure may have occurred, but it's yet to be determined if other factors were in play.
Per Tracy Wilkinson of the Los Angeles Times, state attorney general's office spokesperson Carlos Gonzalez said that the investigation is ongoing.
“So far, the inspection indicates there was a mechanical failure, but we are investigating everything,” Gonzalez said.
BBC is also reporting that the driver tested positive for alcohol consumption after he hit the unprotected barrier.
Witness Daniel Dominguez also claimed that the driver's head hit the steering wheel during the performance.
"The driver hit his head and his helmet flew off," Dominguez said. "The truck came directly at where we were.''
CNN —via a state prosecutor's spokesman—is reporting the driver told authorities he was knocked unconscious after hitting his head inside the truck.
While the crowd seemed to be enjoying the show one minute, it quickly turned to chaos after the driver lost control following a stunt. The truck—which has tires measuring five feet high—went toward a sea of people and immediately crushed several spectators.
Following the incident, the driver of the monster truck was detained on suspicion of negligent homicide.
The remainder of the event was understandably canceled, as investigators attempt to determine what went wrong. "Extremo Aeroshow" was supposed to provide a fun, family atmosphere, but it was marred by an unfortunate tragedy.
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