Fire officers arrived at the scene just after 9.30pm and activated a third alarm, the highest level, when its scale became apparent.
Police will be speaking with the victim once he has recovered from his injuries.
"If you have any information on the whereabouts of the road spikes, we ask you to please contact us."
The stabbing victim has critical injuries.
The crime comes just ahead of ANZAC Day.
Shots were fired at a van taking a group of Raupunga rugby players home after a match.
A van with eight members of the visiting team inside was rammed and shot at while being pursued by up to four vehicles.
The man was reported missing from fishing vessel Pacific Challenger on Monday night, about 11km offshore.
Maritime NZ's Rescue Coordination Centre is coordinating the search, assisted by rescue helicopters from around the North Island.
