Six people have been injured and dozens of homes evacuated in the New Zealand city of Christchurch after a huge gas explosion destroyed one home and damaged others.
The explosion on Friday was felt far from the neighbourhood, with some fearing it might have been an earthquake or a bomb.
Footage of the aftermath shows the home was reduced to a pile of wood and rubble with flames coming out.
Several people who were inside the home at the time survived, including one who remained in Christchurch Hospital in a critical condition.
Health authorities said four other patients remained in stable conditions while a sixth person had been discharged.
Authorities confirmed it was a gas explosion although said they're still investigating the cause. Relatives said the occupants had been having problems with their gas fire.
Neighbor Brad Culver, a US citizen who has been living in New Zealand for eight years, told Television New Zealand he thought at first a plane had crashed and ran outside.
"The house was in a complete pile of timber and rubbish, you couldn't even conceive that it was a house," he said. "There was nothing left standing."
Culver said he started pulling people out.
"They all appeared to be OK, they were in shock but had superficial cuts, bruises, that sort of thing. It didn't look like any life-threatening injuries," he said. "Miracle, really a miracle."
Another neighbour, Ann Gray, told the network she was standing at her kitchen bench just after 10 am when she felt what she thought was a massive earthquake.
"I looked up and I could see all the stuff going up in the air so I came outside, it was all up in the air like it was huge and it was so high, bits of wood," she said, adding that "it took a while to come down, I thought it was going to come down on top of my house."
Belinda Blanchfield told the news website Stuff that her parents along with other relatives and friends were inside the home at the time of the explosion.
"It's our worst nightmare," she said. "My parents are the absolute kindest people ever."
Blanchfield's husband Paddy Blanchfield told Stuff the occupants had been having issues with their gas fire in recent days and had been awaiting repairs, although it was unclear if those had taken place.
Fire and Emergency New Zealand said in a statement that as well as the destroyed home, five neighbouring properties were affected by fire and another 17 were impacted by debris. Firefighters extinguished the rubble fire and were investigating the scene.
Australian Associated Press