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A massive explosion at a fireworks warehouse in Northern California caught on camera has left seven people missing
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Thick black smoke filled the air as debris flew from the warehouse and dozens of secondary explosions rocked the area
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The blast triggered evacuations and knocked out power to roughly 150 homes and farms
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Flames from the explosion burned through 78 acres of vegetation. Two people were hurt in the initial blast
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As of Wednesday, search teams were keeping a safe distance, using drones and aircraft to look for the missing
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Officials have not confirmed whether those unaccounted for are employees or bystanders
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The cause of the explosion, just days before Independence Day, remains under investigation
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Authorities say the destroyed facility was a licensed pyrotechnics business, but it's unclear whether fireworks were produced there or simply stored there for sale
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The blast happened in the community of Esparto, around 40 miles west of Sacramento
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