WorkSafe is now investigating the devastating SkyCity fire that ripped through the New Zealand International Convention Centre in Auckland nearly three weeks ago.
The investigation will focus on the health and safety management systems in place, as well as understanding the work activities taking place at the building the fire began, a WorkSafe spokesman said.
Problems related to the smoke exposure of the huge blaze will not be dealt with in the investigation.
"Issues regarding smoke exposure to members of the public in Auckland's CBD are a public health matter and any questions relating to this should be directed to Auckland Regional Public Health Service," he said.
As the fire is now under normal investigation, WorkSafe will not be providing any further information on the investigation, he said.
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Last week the Herald reported that representatives from 10 different organisations including police, insurers and other Government agencies have been conducting a co-operative investigation.
Fire and Emergency New Zealand region manager Ron Devlin said the investigation, which included mapping affected areas, was ongoing and it was not yet known how long it would take.