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.

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.

Detective Sina Ghaffarpour, a spokesperson for the Sacramento County Sheriff's Office, confirmed that members of his agency's bomb squad helped with the operation. "We were there on a mutual aid request,