A welder working on a pipe caught some insulation on fire Monday at the Nestle Purina plant near Edmond, OK, officials said.
Firefighters got the call shortly after 2:30 p.m. The fire did not get into the building and firefighters were able to extinguish it quickly, fire officials said.
The fire was started when a contractor was welding a pipe on the roof, fire officials said.
The fire was not significant, but about 250 people evacuated the building for about 45 minutes, a company spokeswoman said.
The contractor was treated by paramedics as a precaution, the spokeswoman said. Third-shift operations at the plant will resume as planned.