Massive Fire Engulfs Warehouse in Ontario

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A massive fire erupted at a warehouse in Ontario, California early Tuesday morning, prompting a large response from over 100 firefighters. The fire broke out around 12:30 a.m. near Hellman and Merrill avenues, and officials say multiple people in the area reported hearing a loud boom prior to the flames. The warehouse is a Kimberly-Clark site that specializes in paper-based personal care and hygiene products. It's unclear what started the fire or if anyone was inside the building when it broke out, but no injuries have been reported so far.

Why it matters

Warehouse fires can cause significant property damage and disrupt supply chains, especially for major manufacturers like Kimberly-Clark. The loud boom reported by witnesses also raises concerns about the potential for an explosion or other hazardous incident. Authorities will likely investigate the cause closely to determine if there were any safety violations or other factors that contributed to the blaze.

The details

The Ontario Fire Department responded to the warehouse fire around 12:30 a.m. Tuesday. More than 100 firefighters worked to battle the large flames, which cast an orange glow in the surrounding area. Officials say multiple people in the vicinity reported hearing a loud boom prior to the fire breaking out, but the cause remains under investigation. The warehouse is owned by Kimberly-Clark, a major manufacturer of paper-based personal care and hygiene products. It's unclear if anyone was inside the building when the fire started, but no injuries have been reported so far.

• The fire was reported around 12:30 a.m. on Tuesday, April 7, 2026.

What’s next

Investigators will work to determine the exact cause of the fire and assess the extent of the damage to the Kimberly-Clark warehouse.