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.
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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.