Three others arrested afterwards are not believed to have been involved, Police Commissioner Mike Bush said, but added that he could not be conclusive.
Two remain in a critical condition.
- How attacks unfolded
- The victims and missing
Who was involved?
On Saturday, the main suspect appeared in court in a white prison shirt and handcuffs, smiling for the cameras.
He has been charged with one count of murder – with more charges expected to follow.
An 18-year-old was also arrested but his involvement was said to be “tangential” and he would appear in court on Monday, Commissioner Bush added.
None of those detained had a criminal record.
Mr Tarrant has been remanded in custody without a plea and is due to appear in court again on 5 April.
The presiding judge ruled that the suspect’s face should be pixellated in photographs and moving images to preserve his fair trial rights.
Prime Minister Jacinda Ardern said Mr Tarrant had a firearms licence and owned five guns.
Histories of bravery have been emerging in the aftermath of the attacks.
Two of the six Pakistanis killed – Naeem Rashid, 50, and his 21-year-old son Talha – had been living in New Zealand since 2010.
His brother Khursheed Alam in the northern Pakistani city of Abbottabad, told the BBC’s Secunder Kermani he was proud of his actions.
But he went to add that even though his brother was being hailed as a hero by some people, it was “still a shock for us”.
“It’s our pride now, but still the loss – it’s like cutting your limb off really.”
Mr Alam said he was angry.
“Terrorists don’t have a religion,” he said, adding “crazy people” had to be stopped.
At the other mosque attacked, in Linwood, a similar intervention occurred.
In the ensuing chase, the gunman dropped one of his weapons and went to fetch more from his car, when Mr Aziz tossed the gun towards him, smashing the car window.
The gunman then drove off and was arrested moments later.
Officials in New Zealand are now carrying out the difficult task of identifying those who died. They have shared a list of victims with families, but not released it publicly.
Some of the other victims were:
- Sayyad Milne, 14, who wanted to be a footballer when he grew up
- Daoud Nabi, 71, who is believed to have thrown himself in front of other people in the mosque to protect them
- Khaled Mustafa, a refugee from the war in Syria
- Hosne Ara, 42, killed while searching for her husband who uses a wheelchair – he survived
How events unfolded
A gunman drove to the mosque, parked nearby and began firing into the mosque as he walked in through the front entrance. He fired on men, women and children inside for about five minutes. He live-streamed the attack from a head-mounted camera and identified himself in the footage.
The suspect is then said to have driven about 5km (three miles) to another mosque in the suburb of Linwood where the second shooting occurred.
Ms Ardern said the guns used by the attacker appeared to have been modified, and that the suspect’s car was full of weapons, suggesting “his intention to continue with his attack”.
He had obtained a gun licence in November 2017 that allowed him to buy the weapons used in the attack.
New Zealand’s Attorney General David Parker said the government would look into banning semi-automatic weapons, but that no final decision had been made. Previous attempts to tighten gun laws in a country with a strong gun lobby and culture of hunting have failed.
- What are New Zealand’s gun laws?
The suspect had not been on the radar of security services in New Zealand or Australia.
Before the attacks, social media accounts in the name of Brenton Tarrant were used to post a lengthy, racist document in which the author identified the mosques that were later attacked.
The text is called The Great Replacement, a phrase that originated in France and has become a rallying cry for European anti-immigration extremists. The man said he had begun planning an attack after visiting Europe in 2017 and being angered by events there.
Muslims make up about 1.1% of New Zealand’s population of 4.25 million, according to the latest census figures. Numbers have risen sharply since the 1990s as the country took in refugees from various war-torn countries.
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