Business records also show that Kenneth Chee is the owner of the business at the San Francisco property. Chee, the 48-year-old CEO of the company, was denied a license from the Bureau of Alcohol, Tobacco, Firearms and Explosives to possess fireworks and had a history of firearm convictions, the San Francisco Chronicle reported.

Officials searched a San Francisco home registered as the address for Devastating Pyrotechnics' CEO. Seven died in an explosion at the company's warehouse in Yolo County last week.

Cal Fire's state fire marshal was leading the investigation at the Inner Richmond home on 2nd Avenue, between Geary Boulevard and Anza Street, a Yolo County spokesperson said.

Her son, Joel "Junior" Melendez, 28, was killed in the blast. Lupe said her strong words are directed at the fireworks company that employed her son and also at county and state officials, who have provided limited information in the investigation. Lupe wants her son to be remembered as a great father, brother and friend.

Yolo County officials said that authorized personnel are conducting a "controlled explosive disposal" on Wednesday afternoon at the fireworks site in Esparto.