The causes of several fires in the Bay of Plenty have not been identified.

Firefighters in the Eastern Bay spent Sunday afternoon battling scrub fires and a shelter belt blaze.

Fire and emergency New Zealand northern fire communications shift manager Paul Radden says Maketu, Te Puke and Pukehina volunteer fire brigades were called to a shelter belt fire in Paengaroa just before 4pm.

'Fifty metres of shelter belt was on fire.

'Crews spent about one hour and 30 minutes at the scene.”

Other fires included a scrub fire in Opotiki at 3.26pm, another one in Whakatane at 3.32pm and a third, also in Whakatane, at 3.35pm.

'These were all small scrub fire and were quickly extinguished,” says Paul.

'As far as I can tell, no causes have been identified.”