According to Warrick County Dispatch the fire crews were called to the scene around 8:20 Thursday night and remained there until sometime after midnight.
Employees tell Eyewitness News that the fire broke out in the finishing department of the aluminum plant.
We're told all employees got out of the building safely, however at least one person -- possibly a fire fighter-- was treated after being overcome by the heat.
Three departments responded to the blaze-- including Alcoa's own fire department as well as Newburgh and Yankeetown's.
No word yet on a cause.
PREVIOUS: Eyewitness News reports one person treated for heat related problem in Alcoa Warrick Operations fire. Newburgh and Yankeetown and Alcoa on-sites firefighters are on scene. No other injuries reported. Warrick County Dispatch confirms this information.