Christchurch explosion: Aerial footage reveals scale of destruction

Aerial footage has revealed the scale of the gas explosion in Christchurch.

The footage, captured from a helicopter, showcases the collapsed house and debris covering Marble Ct in the city's Northwood suburb.

Six people were injured in the explosion, which Fire and Emergency NZ (FENZ) has confirmed was a gas explosion.

One house at least has been totally destroyed, with five houses also severely damaged

Fire could be seen rising from the property while debris covered the street. 

At least 17 properties were impacted by debris, FENZ said.

Carpet layer James Looyer, who supplied Newshub with footage of the devastated scene, told Newshub that it felt like an earthquake had struck the area.

"We were just working pretty much 100 metres down the road from, just the next street over," he said.

"We just heard it pop off, we shot down the road there to see what was going on, and it all unfolded from there.

"It just sounded like some sort of bomb. We all came running out of the house we were working in and stood on the road. We thought it was an earthquake to begin with.

"You could feel it shoot through the whole street, through your body. It was pretty full-on."

WorkSafe has been advised of the incident, and is making inquiries.

Cordons surround the properties and motorists have been told to avoid the area.