He said it was the second fire in the same area this afternoon.
Fire crews were called to the area at midday, to fight a blaze that they were able to subdue. The spokesperson said it was too early to tell if the fires were linked.
People working in nearby businesses helped raise the alarm.
David Laurenson said he had called emergency services just before 4pm.
He said he could still see flames and a lot of smoke.
Police had been called to the scene to assist with traffic management.
A fire spokesperson said earlier that there were around eight appliances plus the rural fire service at the scene. A helicopter had also been requested.
He said then that they were getting on top of the blaze.