Seven people were unaccounted for Wednesday after a Northern California warehouse storing fireworks exploded in a huge fireball Tuesday and sent pyrotechnics bursting above the scene, officials said.

Firefighters responded to the warehouse in the Esparto area, northwest of Sacramento, around 5:50 p.m. Tuesday and found explosions and numerous buildings on fire, Esparto Fire Protection District Chief Curtis Lawrence said.

The warehouse then detonated. Helicopter video showed white smoke pouring from the roof before the warehouse erupted in a fireball.