Residents have described how a deadly explosion in West Auckland shattered neighbours' windows and left some residents' eyes stinging.
A body was found after the blast ripped through the property on Monday afternoon.
The force shook nearby homes and blew out neighbouring windows. Debris from the explosion landed in a tree.
A black plume of smoke could be seen drifting from the property on the corner of Don Buck Rd and Universal Dr.
"A body has been located following an explosion at a Henderson address near
Swanson Rd this evening," police said on Monday.
"Police are carrying out a scene examination and are working to understand the
circumstances of the incident.
"Police ask that the public avoid the area if possible while inquiries are under way."
The scene was closed around 8.40pm for the night and the road reopened.
A police spokesperson said a guard would be at the scene overnight and police will recommence investigations tomorrow morning.
Paul Eutnam, at Lower Don Buck Rd Superette, said his first thought when he heard the loud explosion, which happened about 10m from the shop, was that there had been a terrorist attack.
"We've got a solid concrete building here and we could feel the jitter and shakes ... It was very loud.
"I thought there was a local terrorist attack of some sort. My first comparison was what it would be like in 9/11 in New York. That's what it was like - a sudden big bang out of nowhere."
Eutnam said plumes of black smoke erupted into the air followed by white smoke.
Residents gathered in the superette and were reporting a slight irritation of their eyes and nose.
"There was a distinctive smell along with some allergic reactions. It caused quite a commotion. There was a bit of an audience here for about two hours."
Residents were unable to enter their properties and were asking to park outside the shop. The explosion had shattered neighbours' windows and also scared their pets, he said.
Eutnam said the explosion appeared to have happened in a garden shed in the backyard of the property on Universal Drive, but the explosion left a massive hole in the next door neighbour's fence.
He said from Don Buck Rd he could see pieces of corrugated iron from the shed scattered over a 5m tall tree.
Several other residents felt the force of the bang.
A neighbour said the impact felt as if a large shipping container had been dropped on the ground from a big height.
She said it blew out neighbouring windows and black smoke could be seen billowing into the sky.
A resident said the explosion happened near the roundabout on Don Buck Rd and a fire truck was parked up outside the address. Police cars were also present.
Traffic was banked up about 1km along the road as police had blocked off Universal Drive and Fire and Emergency crew were redirecting traffic.
Herald reader Louise Martin commented online: "Sounded like a massive gunshot - or cannon - with a hell of a vibration."
A St John spokeswoman said they were called to the scene at 4.54pm and one ambulance and two support cars arrived four minutes later.
The spokeswoman said they did not treat anyone and left the scene at 6.15pm.