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 investigation remains ongoing. Investigators released the names on Saturday of the seven people who were killed in a massive pyrotechnics facility explosion in Northern California that took place days before the Fourth of July.