An investigation is underway after a U-Haul truck carrying hundreds of pounds of chlorine powder caught fire outside a Costco in Signal Hill Friday.
The fire broke out just before 2 p.m. in the parking lot on the 2200 block of East Willow Street near Cherry Avenue.
The truck was carrying about 600 pounds of chlorine powder, according to the Los Angeles County Fire Department.
Clouds of smoke were seen coming from the truck in the parking lot.
The toxic fumes erupting from the vehicle prompted fire crews to evacuate the Costco and close off the area.
After knocking down the fire, crews remained on scene to monitor the air quality.
An investigation into the cause of the fire is ongoing.