He is expected to face further charges, police said.
Speaking on the email earlier today, New Zealand Police Commissioner Mike Bush said: "It was forwarded to us sometime during the day".
Muzzamil Pathan arrived to offer his condolences for a friend, Imran Khan, who was killed at a second mosque in the suburb of Linwood.
She said by the time police had been made aware of the email, emergency calls were already being received "and somebody was then taken into custody 36 minutes later". He reportedly did not enter a plea for one count of murder.
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. "It's just comprehending what is the incomprehensible". It appeared from the video that he had attempted to stop the assailant as he gunned victims down in the mosque. "My nephew was a student", he said.
"Identification hearings will start this afternoon and we are anticipating that the process of returning the deceased will commence tonight", Judge Marshall said.
"They are not telling us anything", Mr Bhuiyan's friend Kaniz Fatima told AFP, adding that the 30-year-old's name was not on a preliminary list of victims given to families late on Saturday.
The majority of victims were migrants or refugees from countries such as Pakistan, India, Malaysia, Indonesia, Turkey, Somalia, Afghanistan and Bangladesh.
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Bangladesh team leave a changed New Zealand after mosque shootings
I start running towards the main road, when a lady, also heading out in her vehicle , asks if I need a ride. Prime Minister Jacinda Ardern condemned the incident and called it a terrorist attack.
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But he couldn't overcome Nadal , who lost his serve just once in the 1½-hour match in sunny and windy conditions. He will next take on 13th-ranked Russian Karen Khachanov , who beat world No. 9 John Isner 6-4, 7-6 (7/1).
A police officer looks for explosive devices near Masjid Al Noor mosque in Christchurch, New Zealand, March 17, 2019. A couple apprehended at a cordon for carrying firearms not believe to be involved in the attacks, Bush said.
"The fact that there was an ideological manifesto with extreme views attached to this attack, of course, that is deeply disturbing", she 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".
Brenton Tarrant, a 28-year-old white supremacist obsessed with the Crusades, toured the Continent and came to Britain to stay for up to a fortnight in 2017.
Ardern told the briefing that she had been contacted by Facebook operations chief Sheryl Sandberg who had acknowledged what had happened.
Ardern says only a small number of bodies will be released initially, and that authorities hope to release all the bodies by Wednesday.
"As soon as New Zealanders hear that someone was legally able to acquire, as I'm advised, those weapons and carry out this event, that will raise enormous questions with our gun laws, and that is why we will respond swiftly", she explained.
New Zealand has in the past tried to tighten firearm laws, but a strong gun lobby and culture of hunting has stymied such efforts.
Armed police were deployed at several locations in all cities, unusual in a country where levels of gun violence are low.