Hundreds evacuated after explosion on semi-truck carrying hydrogen tanks in SoCal

DIAMOND BAR, Calif. -- An explosion on a semi-truck hauling a payload of hydrogen tanks Sunday afternoon prompted authorities to evacuate hundreds of people from nearby businesses in Diamond Bar.

The incident happened near the intersection of Golden Springs Drive and Brea Canyon Road, as the big rig was hauling 20 individual 50-gallon tanks filled with hydrogen, according to the Los Angeles County Fire Department.

Firefighters responded to the scene and doused the vehicle with water as sheriff's deputies closed the street. A hazardous materials team was also summoned to the location.

About 500 people were evacuated from surrounding businesses.

There were no immediate reports of injuries.

DEVELOPING: More details will be added to this report as they become available.