Firefighters continued to battle a massive fire at a Walmart distribution center in Plainfield, Indiana, into Thursday morning.

The fire began around noon on Wednesday at the warehouse located at 9590 AllPoints Parkway in Plainfield.

Around 1000 Walmart employees were inside the 1.2 million square foot facility when the fire broke out. All workers were able to safely evacuate the building and no injuries have been reported.

Authorities say that 24 fire departments responded to the five-alarm fire.

In a 7 a.m. update, the Plainfield Fire Department reported that crews rotated throughout the night to try to combat hotspots. As of 10 a.m., smoke is still coming from remains of the building.

WTHR reports that the roof of the building is mostly destroyed, as are most of the trucks that were parked near the facility. The extent of damage to the interior won’t be determined until crews can go inside the building, which likely won’t happen until Friday.

Firefighters said on Thursday morning that “units will remain on the scene for quite some time.”

Plainfield Fire Chief Brent Anderson said that it could take weeks until the cause of the fire is determined. The Bureau of Alcohol, Tobacco, Firearms and Explosives is spearheading the investigation.

Walmart says that workers displaced by the fire will still be paid for a 40 hour week plus any overtime. Some workers may be reassigned to other Walmart locations.

We’ve already taken steps to limit the impact to customers by relying on the resiliency of our supply chain facilities and stores across the country to help shoulder the load as we work to normalize operations,” Walmart said.

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