ONTARIO, Calif. (From news reports) -- An arson suspect was arrested after a massive fire erupted at a warehouse in Ontario, prompting a large response from first responders overnight Tuesday, April 7.

The fire was reported around 12:30 a.m. Tuesday near Hellman and Merrill avenues, according to the Ontario Fire Department. More than 100 firefighters were on scene battling the flames that cast an orange glow in the area.

Fire crews remained on scene several hours later as the fire continued to burn through the warehouse, estimated to be 1.2 million square feet.

Officials say multiple people in the area called and reported hearing a loud boom when the fire first broke out.

"This fire was very quickly identified as suspicious in nature," said Deputy Chief Mike Wedell. "There was a subject of interest identified very early on in the incident. That subject has been arrested."

Wedell added that individual was taken to the police department to be interviewed by detectives.

The warehouse itself is a Kimberly-Clark site, a company that specializes in paper-based personal care and hygiene products.

There were employees inside the warehouse when the fire started, but they all managed to safely evacuate.