The 28-year old Australian man Brenton Tarrant who staged terror attacks on two mosques in New Zealand's Christchurch was charged with murder Saturday morning.
The terror attacks on Friday have left at least 49 people dead and 48 injured.
Tarrant was apprehended along with two other Australian men.
New Zealand Prime Minister Jacinda Ardern reiterated to the public on Saturday morning that New Zealand's gun law would be changed in the wake of the terror attacks.
Five guns have been discovered, two of which are semi-automatic guns after the terror attacks. Other weapons and firearms have also been retrieved by the police
It is understood that the killers has a legitimate gun license. "Our gun law will be changed," said Ardern.
Three suspects are now in custody. They are all Australian citizens, but not in any watch list of New Zealand or Australia. A fourth arrest was not related to the killing and the person was then discharged.
Tarrant is charged with murder. Two others are still in custody. He live streamed the killing via social media.
Major public events during the weekend have all been cancelled across New Zealand.