Gas blast cause still unclear

Investigators are still struggling to identify the cause of an explosion that destroyed a Christchurch house.

Several items of interest have been found at the blast site.

Fire and Emergency New Zealand (Fenz) is continuing to investigate the cause and origin of the gas explosion that obliterated a Marble Court house in the northern suburb of Northwood on July 19.

Blast waves threw chunks of roof tiles and other debris around the neighbourhood.

One man was rushed to Christchurch Hospital where he was placed on life support. Five others were also taken to hospital.

Neighbours and passers-by who pulled stunned survivors from the burning debris told the Herald at the time they were amazed that nobody was instantly killed.

Over the past week representatives of Fenz, WorkSafe, police and the insurance industry have worked to reconstruct large portions of the house in which the blast occurred to gain a clearer picture. But the cause of the blast has not yet been definitively established.

Fenz Christchurch Metro Area Commander David Stackhouse indicated that the investigation was likely to continue and would involve the testing of several items of interest found at the blast site.

Personal belongings, including photo albums, have been recovered from a number of the properties badly affected by the explosion and returned to their owners.

The scene of the incident remains under guard while the investigation continues.