TULSA, Oklahoma - An investigation continues into what started a fire on the roof at Bama's North Tulsa factory Tuesday night. 

More than 100 workers at the frozen dough factory had to be evacuated. 

The fire broke out a little after 8 o'clock at the facility located in the 2500 block of North Lewis. 

Tulsa Fire says a maintenance man doing his rounds noticed the flames and called for help.

No one was hurt and the fire was contained to the roof.