CHIHUAHUA, Mexico — An out-of-control monster truck veered into a crowd of spectators at an air show, killing eight people and hurting 79, officials said.
The driver was detained Sunday on suspicion of manslaughter, and officials said they were investigating possible safety violations in the show.
Carlos Gonzalez, spokesman for the Chihuahua State Prosecutors’ Office, said the driver, Francisco Velazquez, appeared to lose control of the truck after leaping over cars it was crushing during a demonstration at the “Extreme Aeroshow” on Saturday.
Video taken from the stands by spectator Krizthall Martinez shows the truck making an initial pass over two cars. It then makes a second pass at higher speed, coming down sharply nose first and bouncing violently before plowing straight into the crowd, which stood directly in the path of the monster truck, unprotected by any wall or barrier.
The three-day show included performances by airplanes, the monster truck acts, and others.
It was canceled after the accident on its second day. The site was a park on the outskirts of Chihuahua, the capital of Chihuahua state.
On Sunday, two armed men threw a firebomb at monster trucks and other vehicles parked at a hotel that were part of an unrelated monster truck production at the air show.
Chihuahua Gov. Cesar Duarte Juarez said his administration, which was listed as a sponsor of the air show, was investigating whether Civil Protection authorities had correctly enforced safety regulations.
He and other officials did not say if those regulations required any protective barrier for spectators.
Some witnesses said the driver appeared to have hit his head on the interior of the truck, nicknamed “Big Show,” as he drove over the old cars.
At least two reported seeing the driver’s helmet come off before the huge vehicle drove into the onlookers, who tried to flee.
“I fell over, and when I turned around, I saw the tire very close. It hit me and threw me to the other side,” Jesus Manuel Ibarra, 41, said as he was treated for an injured arm and hip.
Chihuahua Mayor Marco Quezada said 79 people had been hurt. Twelve remained in intensive care, with four in critical condition, he said.
The governor declared three days of mourning. He said a test had detected alcohol in the driver’s breath, but he did not reveal the level found or say whether it violated any law.
Mr. Gonzalez, the prosecutor’s spokesman, said investigators were looking into the possibility of a mechanical failure that left the driver unable to release the gas pedal.