Tarrant was arrested in a auto, which police said was carrying improvised explosive devices, 36 minutes after they were first called.
Tarrant, described by Australia's Prime Minister Scott Morrison as an "extremist, right-wing, violent terrorist", expressed admiration for other violent white nationalists and his intention to "create an atmosphere of fear" and to "incite violence" against Muslims.
Residents pay their respects by placing flowers for the victims of the mosques attacks in Christchurch.
Another victim, Haji Daoud Nabi, died trying to save a fellow worshiper, his son told an Australian newspaper.
"This attack has been an enormous shock for all New Zealanders, and I am aware that there is a real sense of fear and concern for personal safety, particularly among our Muslim communities", New Zealand police commissioner Mike Bush said.
He has so far been charged with one count of murder, although judge Paul Kellar said it's "reasonable to assume" that more charges will follow, after yesterday's deadly shooting.
"But that arrest was tangential to this matter and we do not believe that he was involved in this attack either", he said.
The victims of Friday's shooting included immigrants from Jordan, Saudi Arabia, Turkey, Indonesia, and Malaysia.
Mosque worker Abdul Aziz risked his own life to challenge the gunman and try to snatch his weapon, according to attack survivor Syed Mazharuddin.
"The magnitude of this is the thing that is the most significant issue for people".
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Friday, and expected to continue to rise to near 33.5 feet by Tuesday, according to the weather service. Grand River (Caledonia and Cayuga): River ice remains present in the southern Grand River.
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Syrian refugee Khaled Mustafa, who had arrived in New Zealand with his family just months ago, was amongst those killed on Friday.
She also signalled that if convicted, he would serve his sentence in New Zealand.
Unlike the USA, the right to own a firearm is not enshrined in New Zealand's constitution.
The grandmother of the man allegedly responsible for the twin Christchurch mosque terror attacks that have killed 50 has spoken to 9News of her disbelief and devastation.
"I'm advised that there were five guns used by the primary perpetrator..."
According to a recent report from the Anti-Defamation League (ADL), domestic extremists killed 50 people in the United States past year - an overwhelming majority of which were perpetrated by right-wing extremists.
Ardern said she had spoken with Trump, who asked how he could help.
This senseless attack is an affront to the people of Christchurch and New Zealand, and the broader Muslim community.
During the emotional service the woman all held a placard with the words: "Peace will save the world #Solidarity with New Zealand mosque victims". "New Zealand is home for all of us, and this despicable act will not change that feeling of closeness in us".