The fire was first reported around 12:30 pm.
Officials say the fire was contained to the exterior area of the roof and was not inside the building at any time.
Video sent in by ABC30 insider Kenneth Hawkins showed people being evacuated from the building and plume of smoke rising from the tower.
Officials say everyone inside the casino was evacuated safely, but it will remain empty for at least another hour while crews investigate.
Firefighters who were staying on the property were able to douse the blaze.
The cause of the fire is under investigation.
This is a developing story.