The unprecedented mass shooting was carefully planned and shocked the normally peaceful nation.
New Zealand Prime Minister Jacinda Ardern described the attack as one of the "darkest days" of their country. She said that the suspects held "extremist views" that have no place in New Zealand or anywhere else in the world.
An Australian citizen in his late 20s was charged with murder. Immediately after the shootings, two more people were arrested.
Here's what we know so far.
Where the shootings took place in Christchurch
An armed man met two mosques in the center of Christchurch around noon on Friday noon. Friday is the busiest day for many mosques around the world.
The first and most deadly shootout took place shortly after 1
A graphic video that was streamed live on social media for 17 minutes Allegedly, part of the attack is said to show a man driving through the streets of Christchurch before reaching the mosque and finally opening the fire.
The terrible attack on the Al-Noor mosque, including the time the shooter returns The car for rearmament lasts about six minutes.
When the shooter removed the Al Noor mosque, he opened fire on several people walking along the street, the video seems to show.
Shortly after the livestream was over, a second attack took place in the Linwood Mosque. At least seven people were killed there, another died later in the hospital.
Several weapons were found at both locations. Ardern said that improvised explosive devices had also been found on the scene.
What we know about the suspects
He appeared on Saturday in Christchurch. During his brief appearance, Tarrant was handcuffed and accompanied by three Taser-armed officers. He was silent during his court appearance and was again remanded on April 5.
Shortly before the shootings, a link to an 87-page manifest on Twitter and 8chan, an online messaging board used by anonymous accounts to share extremist messages and cheer on mass shooters, was added to an account in Tarrants name booked
The manifest is not signed. His author claims to be a 28-year-old white man born in Australia. It is filled with immigrants and Muslims as well as explanations for an attack.
Tarrant traveled around the world "with sporadic times in New Zealand," Ardern said in a press conference. She added that he was stationed in Dunedin, New Zealand, at the time of the attack.
She told reporters that none of the people arrested, including Tarrant, were on an observation list.
New Zealand's Weapon Control Laws Scrutinized
Prime Minister Ardern announced early Saturday local time that the New Zealand arms laws would change in response to the terrorist attack.
She said the main culprit had a weapons license and used five weapons during the attack – two semi-automatic weapons and two shotguns.
"While working on the chain of events leading to both possession and possession of this weapon license, I can tell you something now, our gun laws are going to change," she said at a Wellington press conference.
CNN members Eliza Mackintosh and Gianluca Mezzofiore contributed to this story.