The July 1 explosion near Esparto leveled at least one building and ignited a 78-acre fire in an agricultural area about 40 miles northwest of Sacramento, killing seven people.

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,