Firefighters responded to Milk Lane in Newington for a report of a fire and explosions at a dairy plant Saturday morning.
An employee at Saputo Dairy Foods at 100 Milk Lane made a 911 call reporting a fire on the outside of the building just before 7 a.m.
Heavy smoke was coming from the building at it was evacuated as firefighters arrived. No injuries were reported.
As a precaution, emergency crews treated the fire as a hazmat situation because the plant houses large amounts of ammonia.
The fire was electrical in nature and the explosion that was reported was actually an electrical popping sound, according to fire officials.
Eversource crews were also called to cut power to the plant.
It took firefighters about 45 minutes to extinguish the fire and damage was contained to the outside of the building. The fire marshal is investigating the cause.
