About 20 appliances are battling a large fire at Carter Holt Harvey's Kopine Mill near Thames.

Residents are reporting seeing large flames from as far away as Ngaruawahia.

A fire and emergency shift manager confirmed there were two large piles of wooden pallets on fire.

Crew from around the Waikato were in attendance to assist with water supply.

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Fire crew were alerted to the fire at 9.20pm.

Call #100: Mill fire near Kopu, from Tues 10/4 & Wed 11/4. (Pics credit: RFF Rick Watson)

Posted by Thames Volunteer Fire Brigade on Tuesday, 10 April 2018
Piles of burning material ablaze as firefighters get busy extinguishing the flames. Photo/TVFB
Piles of burning material ablaze as firefighters get busy extinguishing the flames. Photo/TVFB
A truck and trailer unit gets caught up in the flames which were fanned by strong winds last night. Photo/TVFB
A truck and trailer unit gets caught up in the flames which were fanned by strong winds last night. Photo/TVFB