The Police Association says police had to take action to stop a car that crashed, killing three teenagers in Christchurch.
The stolen car had been travelling in excess of 130 kilometres an hour through city streets.
Police laid road spikes, which the vehicle hit and crashed into a tree and caught fire.
Police Association President Chris Cahill told Andrew Dickens the driving was clearly dangerously before police got involved.
"And even after police pulled out of the pursuit, it still continued to be dangerous, so police had to take some action. I don't think anyone could have envisioned the result of what they were trying to do."
Cahill says it's a tragedy, and he says they wish it hadn't occurred.
"No one deserves what happened last night. There were no winners here."
He says people need to understand the harm and damage that comes out of tragedies like this.
Cahill says that road spikes are an important part of their armoury, as they are meant to deflate the tyres so that cars slow down.
He says that it looks like the fuel tank exploded, which is what caused it to catch on fire.
"It's very unusual in vehicles these days. There's a bit of inquiry that needs to be done around those."
LISTEN TO CHRIS CAHILL TALK WITH ANDREW DICKENS ABOVE