Prime Minister Jacinda Ardern says gun laws will change in light of Friday's shootings in Christchurch where 49 people had lost their lives.
She said the main offender was in possession of a gun licence, obtained last November. Five guns were used in the attack including two semi-automatic weapons.
Ardern said more work will be done to trace the guns but made one thing clear: "Our gun laws will change."
A 28-year-old man has been charged with murder and two others are in custody after the shootings at two Christchurch mosques. Another person was arrested earlier on Friday, but it was not related to the shootings.
Forty-one people had died at the Deans Ave mosque, while seven had died at Linwood and one in hospital.