Fire in a pole building west of Duluth on Wednesday killed dozens of sheep, authorities said.

A 911 caller alerted the Carlton County Sheriff's Office about 12:25 p.m. to the blaze burning on property on Koski Road in Thomson Township.

The property owner was not at home when firefighters arrived to extinguish the flames, the Sheriff's Office said. The owner later said that none of the 70 sheep in the building survived.

While the cause of the fire was not yet known, authorities said it did not appear to be suspicious.