LAPD Chief: Human error likely behind fireworks explosion in South LA Ringo H.W. Chiu/AP The remains of an armored Los Angeles Police Department tractor-trailer are seen after fireworks exploded Wednesday evening, June 30, 2021. A cache of illegal fireworks seized at a South Los Angeles home exploded, damaging nearby homes and cars and causing injuries, authorities said. (AP Photo/Ringo H.W. Chiu) and last updated 2021-07-19 19:12:07-04 LOS ANGELES (CNS) - Police Chief Michel Moore said Monday human error likely contributed to a destructive fireworks explosion in South Los Angeles, with bomb squad technicians vastly underestimating the amount of explosive material placed into a containment truck.