Firefighters are looking for hot spots, while others are standing by, at the Nexeo Solutions chemical plant in southeast Garland.
An explosion rocked the facility Friday afternoon, which was followed by a fire that burned for at least five hours.
On Saturday, Garland fire officials said they're still in the process of determining the exact cause.
All 41 workers have been accounted for, though the federal agency that investigates workplace incidents, OSHA, is now on the case.
The incident occurred sometime before 3:30 at 3101 Wood St., off S. Jupiter Road, in a facility that is related to the production of Valvoline oil and other products.
Towering fuel-fed flames and a massive plume of black smoke, which could be seen from as far away as Arlington, were spewing from a building of corrugated metal.
A few storage tanks, much taller than the building and located just beside it, steamed from their tops but it was not clear what they contained. Firefighters cooled the tanks by spraying them with water but were forced to take a mostly defensive position against the fire.
Police cordoned off the area and Garland police representative Joe Harn said an evacuation was ordered for a half-mile perimeter around the plant. A no-fly zone was also established.
Dallas County health officials were also at the scene to assist with runoff concerns and were checking air and water quality.
A Sky 4 helicopter crew reported hearing a large explosion that led them to the scene. Several FOX 4 viewers also said they heard a booming sound and workers told firefighters there were at least two explosions.
KDFW FOX 4
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