Described by Australian Prime Minister Scott Morrison as "an extremist, right-wing, violent terrorist", Tarrant's manifesto made it clear that the gunman posited himself as something different: "just a regular white man".
Huge piles of flowers were laid at sites near the mosques and passersby of all faiths stopped to pay respects. "Mosques are welcome to open their doors if they choose to do so".
The second attack took place at the Linwood mosque about 5 kilometers (3 miles) away. Police said the alleged shooter was arrested in a vehicle, which was carrying improvised explosive devices, 36 minutes after they were first called.
Imran had dropped off his father, an electrical engineer, at the Al Noor mosque on Friday and was looking for a parking space when the shooting began. "He was a self-made man", Pathan said.
Greg Robertson, head of surgery at Christchurch Hospital said staff were used to seeing gunshot wounds and severe injuries, but the scale and nature of the attacks was different. "Just helping people is his main thing".
Forty-one people were killed at the Al Noor mosque.
Pakistan's high commissioner said six citizens had been killed and three were missing.
"He was studying to be a pilot and we saw him for morning classes. Then he went to the mosque as usual", he said.
Cook Islands prime minister Herny Puna said his country's prayers first and foremost were with the victims of the shooting, "their families, friends and loved ones whe are now faced with the irreconcilable loss of their loved ones".
Indonesian-born aeronautical engineer Lilik Abdul Hamid and a refugee from Afghanistan, Daoud Nabi, were among the victims.
An attack at Linwood Mosque killed seven more, and one victim died at a hospital, leaving the country reeling after its deadliest mass shooting in recent history.More news: New Zealand mosque shootings: FB, Twitter face scrutiny after livestreaming of attack
More news: Israel fires on Hamas targets after rocket attacks
More news: Kylie Jenner nearly gave Stormi a completely normal (and super pretty) name
At least 49 people were killed in Friday's attack.
Two other people have been arrested in connection with the terror attack, and they remain in custody as police conduct an ongoing investigation as to their possible involvement.
A man was charged with a separate firearms offence and a woman was released without charge.
Questions have been raised about why Tarrant had appeared on a watchlist of New Zealand or Australian security agencies.
Ardern reiterated her promise that there will be changes to the country's gun laws in a news conference Sunday, saying her Cabinet will discuss the policy details on Monday. Her father Waseem, 33, is said to be in a stable condition. The wounded included a two-year-old boy and a four-year-old girl.
The Pacific Music Awards organisation in New Zealand also expressed its shock and solidarity over the shootings.
Facebook, Twitter and Google scrambled to take down the gunman's video, which was widely available on social media for hours after the bloodbath.
The violence has also shone a new light on gun control.
Ardern has said Tarrant was a licensed gun owner who bought the five guns used in the crimes legally.
He used a semi-automatic shotgun as well as a modified semi-automatic rifle as he pummelled victims with multiple bullets.
"Our gun laws will change".