CASA GRANDE — Fire investigators were on the scene this week searching for the cause of a blaze Friday that destroyed a vacant warehouse in Casa Grande.

Assistant Fire Chief Dave Kean said it’s still uncertain how the fire started in the warehouse on Jimmie Kerr Boulevard, near Interstate 10.

It took about 4½ hours for 52 firefighters, including those from Casa Grande Fire Department and several neighboring agencies, to get the blaze under control, Kean said.

On Saturday, Casa Grande firefighters were back on the scene after embers from the blaze ignited additional fires in nearby brush and a dumpster.

“The building was still smoldering on Saturday when high winds blew some of the embers,” Kean said.

By late Saturday afternoon, brush and dumpster fires were extinguished and the smoldering had stopped.

Tuesday, crews were mopping up at the scene, Kean said.

Located near a former campground, the distinctive purple building is visible from I-10. Although it’s been vacant for years, Kean said the facility was being used for storage.

“The building is a total loss,” Kean said.

Under a mutual aid agreement, firefighters from Eloy, Arizona City, Maricopa, Sun Lakes, Chandler, Phoenix and the Arizona Medical Authority and Pinal Regional Fire District assisted the Casa Grande Fire Department on Friday.

Kean said it is not safe for people to visit the scene of the fire.

“After something like this, we do always get a few sightseers,” he said. “But I advise people to stay away.”