The blaze broke out at the Tire Recycling Atlantic Canada Corporation around five o'clock Wednesday morning.
Authorities say a pile of tire rubbings was apparently the source.
Investigators aren't sure why the fire started there. A cloud of black smoke hung over the town, near Fredericton, prompting officials to consider the evacuation of a nearby hospital. But mayor Gary Dipaolo says that won't happen. Firefighters have managed to bring the blaze under control and the black smoke has turned to white. He says only a few tires are smoldering, right now.