A witness to a fire at two connected properties in Onekawa said it caused a bang heard at least a kilometre away.
A Fire and Emergency New Zealand (FENZ) spokeswoman said three fire trucks responded to multiple reports of a fire in Cottrell Cres, Onekawa at 12.10pm on Wednesday, arriving minutes later to plumes of smoke across the area.
A police spokeswoman confirmed police had blocked off both ends of Venables Ave about 12.30pm.
The FENZ spokeswoman said firefighters were still in attendance bringing the fire under control about 12.45pm.