A “monster truck” spun out of control and mowed down spectators at an event in northern Mexico, killing at least eight people, including four children, officials said.

The driver told authorities he passed out after hitting his head, a state prosecutor’s spokesman said.

State Gov. Cesar Duarte told reporters Sunday that it was possible the truck’s driver drank alcohol before Saturday’s deadly crash.

Blood tests were conducted and prosecutors will determine who was responsible, Duarte said.

The crash injured dozens of people, Duarte said. On Sunday, 28 of them remained hospitalized — 12 of whom were in critical condition.

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