Fires burn across South Island

South Island firefighters are being kept busy with a string of scrub blazes.

Two water tanks are being used to contain a fire near Ranfurly in Otago.

At least 50 hectares has been destroyed as it burns along Waipiata-Kokonga Rd.

The fire has caused the closure of parts of the Central Otago Rail Trail.

It's believed it was caused by lightning.

Meanwhile, firefighters have managed to contain a large fire on Christchurch's Port Hills. A spokesperson described the fire on Summit Rd as "very large".

The AM Show reporter Erin Speedy is at the cordon and said authorities will be trying to work out what caused it.

"The fire has been fully extinguished, but police and fire authorities will be making enquiries to figure out the cause of that blaze," she said.

"At the moment they are treating it as unexplained, but a fire investigator will be sent to the scene this morning to try and figure out how that started."

A fire engine in the truck.
Emergency services outside one of the fires. Photo credit: The AM Show

Ms Speedy said investigators will be trying to figure out the actual size of the fire this morning, which is believed to have burn both sides of the ridgeline at Coopers Knob, an area around three hectares in size.

There's better news further north, with the massive Pigeon Valley blaze finally brought under control. A man has been charged with arson.

Newshub.