PM Jacinda Ardern says New Zealand's cabinet has backed gun law changes "in principle" after an attack on two mosques left 50 dead and many injured.
Australian Brenton Tarrant, 28, has been charged with murder. Police say the killer used military-style assault weapons that appeared to have been modified to make them more deadly for the attack.
Friday's events sparked calls for gun law reform, with Ms Ardern saying soon after that "our gun laws will change".
Speaking at a press conference after a cabinet meeting, Ms Ardern said she expected to give details of the reforms by 25 March.