clipped from: www.nzherald.co.nz 
Fire safety officers will wait for a fatal fire at a Hamilton dairy coolstore to burn itself out before they begin an investigation into its cause.
There is believed to be concern toxic runoff could pollute Waikato River if too much water is dumped directly on the flames.
"The fire is contained and it's being monitored. It's just being left to burn out."
One firefighter is dead and six others remain in hospital, some in critical condition, following the explosion and blaze at the Icepak Group's Tamahere coolstore.
Senior Station Officer Derek Lovell, who had at least 25 years service, died from his injuries at Waikato Hospital overnight.
The cause of the blaze is not yet known, but the Fire Service said a gas leak might have been responsible.
The building exploded as the officers entered, injuring them all.
Photos: Blaze injures firefighters, smoke plume seen for miles
Video: Coolstore fire burning