The Office of the State Fire Marshal (OSFM) announced Tuesday that it has suspended the pyrotechnic licenses of two people tied to the deadly fireworks explosion at a Northern California facility on July 1.

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.

The cause of the fire, which burned 78 acres, remained under investigation, according to Cal Fire, the state firefighting agency.