A 27-year-old man has been arrested on suspicion of possessing a destructive device tied to a pyrotechnic explosion that killed a 17-year-old in South Los Angeles. The blast happened around 9:25 p.m. on December 3, when 77th Division officers responded to the 400 block of West 84th Street after a person was manipulating pyrotechnic materials that detonated.
According to MyNewsLA.com, the Los Angeles Police Department announced the arrest of Giovanni Diaz, 27, after major crimes division investigators and other law enforcement personnel served search warrants at a storage facility in Rancho Cucamonga and a residence in the 900 block of North Duesenberg Drive on September 30. That address sits in San Bernardino County, roughly 45 miles east of the South LA explosion site. Diaz was taken into custody after investigators located him during the searches and was booked on suspicion of possession of a destructive device, with bail set at $500,000. Police also said he is suspected of child endangerment and narcotics offenses.
The 17-year-old victim sustained serious injuries in the explosion and was transported by Los Angeles Fire Department paramedics to a hospital, where the teen later died as a result of those injuries. Bomb squad personnel, a hazardous material unit, and major crimes division investigators conducted a post-blast investigation at the scene, during which authorities seized a large quantity of illegal pyrotechnic devices and took them to a safe storage location.
What Investigators Found During the Searches
During the searches connected to Diaz's arrest, investigators recovered multiple explosive devices and components, along with cash and narcotics and drug paraphernalia, the outlet's report notes. The scope of those seizures, spanning a commercial storage unit and a suburban home outside LA city limits, points to a supply chain that investigators were tracking well beyond South Los Angeles.
Diaz's arrest fits into a broader pattern of large-scale illegal fireworks stockpiles turning up inside South LA homes and storage sites. Just one block from the December explosion site, LAPD officers executing a search warrant in May 2026 discovered over $150,000 worth of illegal consumer fireworks filling every room of a home on the 100 block of West 85th Street, according to FOX 11 Los Angeles.
Strict Local Rules, Heavy Potential Penalties
Under Los Angeles Municipal Code Section 57.5608.1.2, all fireworks are completely illegal within city limits, prohibiting possession, sale, or discharge of any pyrotechnics regardless of state certification, per Southern California Wildfire Response. State law layers on additional exposure: under California Health and Safety Code Section 12700(b), possessing unaltered dangerous fireworks carries misdemeanor charges with fines ranging from $500 to over $50,000 depending on the weight of material seized, according to the Los Angeles County Fire Department.
Possession of a destructive device is itself classified as a wobbler offense punishable by up to three years in state prison under California Penal Code Section 18710, while possessing materials with intent to manufacture an explosive carries two to four years under Section 18720, according to Eisner Gorin LLP. How those destructive-device statutes will interact with Diaz's pending child endangerment and narcotics counts remains an open question in the case.
A City Still Reckoning With Past Fireworks Disasters
South LA's history with seized pyrotechnics carries particular weight for residents. In July 2024, the Los Angeles City Council approved a $21 million settlement for displaced South Los Angeles residents after a June 2021 LAPD bomb squad attempt to detonate seized illegal fireworks accidentally destroyed homes and injured 17 people on East 27th Street, as reported by the Los Angeles Times. That 2021 blast damaged 22 residences and 13 businesses, leaving lasting scrutiny over how law enforcement handles seized explosives in the neighborhood.
The danger extends beyond South LA. Los Angeles Fire Department data compiled in late 2025 showed illegal pyrotechnics ignited hundreds of fires across the city that year, including a Pacoima house fire in July 2025 that killed one person and destroyed six homes, per CBS News. A separate joint law enforcement operation in June 2026 seized roughly 10,000 pounds of illegal fireworks valued at $120,000 from a commercial building in Los Angeles, along with improvised explosive devices and firearms, the same outlet reported.
Neighboring jurisdictions have responded by toughening enforcement. In June 2026, Huntington Park raised administrative penalties up to $5,000 per violation for possessing or discharging illegal fireworks ahead of holiday enforcement pushes, according to Citizen Portal.
LAPD's 77th Street Division, which first responded to the December explosion, covers South Los Angeles neighborhoods that historically record some of the highest volumes of violent crime and emergency calls in the city. Anyone with additional information about the explosion is asked to contact Major Crimes Division Detective Allen at 213-486-7260. Tips outside of business hours can be directed to 877-527-3247, and anonymous tipsters may contact Crime Stoppers at 800-222-8477 or LACrimeStoppers.org.
