Fire crews are today back working at the large fire which started at a recycling plant on Hillside Road, Wairau Valley, Auckland around 5.30pm last night.

Assistant Commander James Hall say three fire trucks and two ladder trucks are working with two diggers to open up the structure to fully extinguish the fire.

"While there are small flare ups, there is no significant smoke and the lithium-ion batteries involved in the fire are no longer a hazard," he says.

"The emergency message alert advising people to stay inside was lifted during the night.

"Crews continue to monitor the fire and an investigation into the origin and cause of the fire is underway.

"Crews are expected to remain at the scene until later this afternoon."

This is the final update.

© Scoop Media