On Saturday, the prime minister said the "primary perpetrator" in the shootings was a licensed gun owner and legally acquired the five guns used.
The gunman also livestreamed in graphic detail 17 minutes of his rampage at Al Noor Mosque, where, armed with at least two assault rifles and a shotgun, he sprayed worshippers with bullets over and over, killing at least 41 people.
Ardern said 39 people remained in hospital, of whom 11 were in intensive care. New Zealand's police commissioner, Mike Bush, said they were "working through" whether one or both of them had any involvement in this incident.
"While work is being done as to the chain of events that led to both the holding of this gun licence and the possession of these weapons, I can tell you one thing right now - our gun laws will change", she said.
But the 87-page document, also posted on social media just before the shooting began, was filled with anti-immigrant, anti-Muslim screeds.
Fuller says Tarrant's family is from the northern New South Wales town of Grafton and contacted police after seeing media reports of the shootings that killed at least 49.
Families of the Sandy Hook victims were recently given the green light to sue U.S. gunmaker Remington for knowingly marketing a military grade weapon that is "grossly unsuited" for civilian use and has become the gun of choice for mass killings.
After the suspect left the court, the judge said that while "there is one charge of murder brought at the moment, it is reasonable to assume that there will be others". Two explosive devices were also found in his auto.
A video captured by passerby Nathan Cambus shows the moment two police officers, guns drawn, approached a auto.
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She said attempts had been made to change New Zealand's [gun] laws in 2005, 2012 and in 2017 following an inquiry.
He appeared in Christchurch court on Saturday where he faced one charge before he was remanded in custody.
"I am deeply saddened by the terror attack in New Zealand & stand with our Muslim community to condemn this hate-fuelled violence", Mayor John Tory tweeted.
At least one of the weapons used by Tarrant was reportedly an AR-15 - the same semi-automatic rifle used in a number of mass shootings in the United States, including the 2012 Sandy Hook school killings in CT.
Ardern also said it was believed the weapons used in the attack had been modified and that loopholes that allow such modifications would be closed in proposed gun reforms to be discussed by cabinet on Monday.
Condemning the terror strike, Ardern had described it as a "terror attack" and said it "appears to have been well planned".
It was by far the deadliest shooting in modern New Zealand history.
"We have had patients with injuries to most parts of the body that range from relatively superficial soft tissue injuries to more complex injuries involving the chest, the abdomen, the pelvis, the long bones and the head", Roberson said.
Aziz said: "He gets into his vehicle and I just got the gun and threw it on his window like an arrow and blasted his window".
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