Six-Alarm Fire Destroys 1.2 Million Square Foot Warehouse in Ontario Arson Investigation

A six-alarm fire destroyed a Kimberly-Clark warehouse in Ontario, California. Authorities suspect arson as the blaze threatens West Coast toilet paper supplies.

By: AXL Media

Published: Apr 9, 2026, 11:25 AM EDT

Source: Bisnow

The Destruction of a Mega-Logistics Hub

The fire originated Tuesday morning at the Ontario Ranch development, a 2.6 million square foot industrial project managed by Clarion Partners and Real Estate Development Associates. The specific building affected was a 1.2 million square foot structure that Kimberly-Clark had pre-leased in 2019. Despite the efforts of over 170 fire personnel, the intensity of the flames caused the building’s structural integrity to fail, resulting in a full roof collapse. While the Ontario Fire Department managed to contain the blaze to its building of origin by Tuesday afternoon, Ontario Deputy Fire Chief Mike Wedell confirmed that the entire stock of tissue and toilet paper housed within was lost.

Arson Investigation and Suspect Apprehension

Law enforcement and fire investigators quickly pivoted to an arson probe after preliminary evidence suggested the fire was intentionally set. Police have detained a 29 year old man from the neighboring city of Highland in connection with the incident. The suspect is identified as an employee of a third party logistics firm responsible for distributing Kimberly-Clark products from the Ontario site. While a motive has not been officially disclosed, the scale of the damage suggests a deliberate and coordinated ignition that bypassed standard industrial fire suppression systems.

Strategic Market Impact and Supply Chain Disruption

The destruction of the Ontario warehouse is expected to have an immediate ripple effect across the consumer goods market on the West Coast. Kimberly-Clark, a global leader in paper products, faces a significant logistical hurdle as this facility served as a primary distribution node for the Pacific region. Industry analysts report that the lost inventory represents roughly 3% of the company's total sales volume. This sudden reduction in available stock may lead to temporary shortages and price volatility for essential paper goods in California, Oregon, and Washington as the company works to reroute supply from other national hubs.