Monster truck crash kills eight, injures dozens at Mexican air show (VIDEO)

At least eight people were killed and over 80 injured after a "monster truck" ran over spectators during the "Extremo Aeroshow" in Chihuahua, Mexico, according to the Mexican state news agency Notimex.

The city's mayor, Marco Quezada Martinez, told the agency that he has ordered an investigation into the incident after the truck lost control after rolling over an obstacle and plowing into the crowded stands. Initial reports blame the tragedy on mechanical failure. But witnesses said the driver lost his helmet and hit his head before the terrible scene unfolded.

According to the event's website, the show includes aerobatics, skydiving, hot air ballooning, motorcycles, fireworks and monster trucks.