Auckland Mayor Phil Goff condemned the sale of semi-automatic, military style weapons like the one allegedly used in the Christchurch terror attack.
He spoke to Newshub after addressing crowds at an Auckland vigil for victims of the Christchurch shooting.
Goff said the sale of weapons such as the AR-15 allegedly used in the Christchurch massacre was unnecessary and dangerous.
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"There is no place in my view in NZ for military-style, semi-automatic weapons designed to kill people."
He said parliament had tried to pass tighter gun laws many times, but following the death of 50 people on Friday, there was now a fresh push for change.
"We have tried and tried and tried again in Parliament to get a more progressive gun law, it has always been stymied, this time I think the momentum is there to make the changes.
"Just as it did in Scotland the changes after Dunblane, and in Australia the changes after Port Arthur, people will feel that we have to respond, that we cannot let this happen again."
Goff said without the powerful semi-automatic gun, the alleged shooter would not have been able to cause as much damage, and "many more people would be alive today."
"Controlling military style semi-automatics is one way we can diminish the damage and protect New Zealanders for the future."