One man was killed and another was injured in an explosion at a truck service and repair company in Corona on Tuesday, authorities said.
The blast was reported about 2 p.m. at National Distribution Services, 340 N. Grant St. (map), according to the Corona Police Department. The explosion did not trigger a fire.
The site was evacuated as investigators checked for hazardous materials.
The man who died was in his 50s, police said. The other victim was taken to the hospital in unknown condition.
Police said an employee was welding a petroleum tanker truck at the time of the blast.
"It was a sudden explosion, like an impact," a witness said. "The windows rattled like they were going to break."
Aerial footage showed a large hole on the roof of the building.
The California Occupational Safety and Health Administration (Cal/OSHA) will investigate the incident, police said.
Corona Fire Battalion Chief Mike Samuels told NBC4 there was a previous explosion at the business in 2012, as well. There were no injuries.
Clarification: An earlier version of this article stated that the US Occupational Safety and Health Administration was investigating the explosion, but Cal/OSHA is investigating the incident.