....The explosion and fire were caused by a leak of the highly flammable gas Hychill Minus 50 which is 95 per cent propane.
The Labour Department, Fire Service and Waikato District Council, which handled building consents for Icepak's Tamahere plant, were all unaware that the gas was being used.
Icepak Coolstores Ltd has admitted using the gas as a refrigerant without complying with safety requirements but has said it did so unwittingly.
Mr Matenga said that should he conduct an inquiry it could involve an assessment of regulations....
....The guilty pleas may lead to compensation for victims of the fire.
At the hearing at which the guilty pleas were entered, Judge Robert Spear noted that compensation would be discussed at a restorative justice process to occur before Grattan and the two companies are sentenced in December.