In short
On March 15, 2019, a gunman killed 51 people and wounded 40 others across two mosques in Christchurch, New Zealand, in a mass shooting motivated by white supremacist ideology. The attacker livestreamed the violence and left a lengthy manifesto online. The attack prompted immediate policy responses, including New Zealand's swift passage of gun control legislation, and became a flashpoint for global conversations about online radicalization, far-right extremism, and the weaponization of social media.
How it unfolded.
The five-minute version
What actually happened.
New Zealand Christchurch Mosque Shootings (2019) - New Zealand.
As it was happening
12 voices, 531 days.
One beat at a time. Click any dot on the timeline to jump, press play for autoplay, or use the arrow keys to step.
Christchurch shootings occur
Brenton Tarrant, 28, carries out attacks on Al Noor Mosque during Friday prayers and Linwood Islamic Centre. He livestreams portions of the violence on Facebook and had distributed a manifesto outlining white supremacist ideology and grievances hours before the attack.
As it was happening
12 voices, 531 days.
Day 0 · March 15, 2019
Christchurch shootings occur
Brenton Tarrant, 28, carries out attacks on Al Noor Mosque during Friday prayers and Linwood Islamic Centre. He livestreams portions of the violence on Facebook and had distributed a manifesto outlining white supremacist ideology and grievances hours before the attack.
Day 0 · March 15, 2019
Attacker arrested
Police apprehend Tarrant near Linwood. He is charged with 51 counts of murder, 40 counts of attempted murder, and one count under the Terrorism Suppression Act 2002.
“What happened here was an act of terrorism.”
- Press statement, Parliament, Wellington, Mar 15
“He came in with a gun.”
- Synthesized from period accounts - Witness interviews, international media, March 2019, Mar 15
“We are one nation.”
- Synthesized from period accounts - Community address and media interviews, March 2019, Mar 16
“This is the result of decades of hateful rhetoric and…”
- Synthesized from period accounts - Community statements and media commentary, March 2019, Mar 16
“This is a watershed moment for our nation.”
- Synthesized from period accounts - Commentary and interviews, March 2019, Mar 17
“Police apprehend Tarrant near Linwood.”
- Attacker arrested, Mar 15
“Brenton Tarrant, 28, carries out attacks on Al Noor Mosque…”
- Christchurch shootings occur, Mar 15
Day 6 · March 21, 2019
Prime Minister Ardern announces gun reform
Jacinda Ardern signals intention to ban semiautomatic weapons and announces a buy-back scheme. Parliament begins expedited legislative process.
“Jacinda Ardern signals intention to ban semiautomatic…”
- Prime Minister Ardern announces gun reform, Mar 21
Day 26 · April 10, 2019
Arms Amendment Bill passes first reading
New Zealand Parliament votes 119-1 to pass the first reading of the Arms (Prohibited Firearms, Magazines, and Parts) Amendment Bill.
“New Zealand Parliament votes 119-1 to pass the first…”
- Arms Amendment Bill passes first reading, Apr 10
Day 255 · November 25, 2019
Gun control legislation enacted
Arms Amendment Act receives royal assent. The law prohibits semiautomatic and pump-action firearms, magazines holding more than 10 rounds, and certain other weapons. It represents one of the world's fastest legislative responses to a mass shooting.
“Arms Amendment Act receives royal assent.”
- Gun control legislation enacted, Nov 25
Day 377 · March 26, 2020
Tarrant pleads guilty
Brenton Tarrant enters guilty pleas to all charges: 51 counts of murder, 40 counts of attempted murder, and one terrorism charge.
“Brenton Tarrant enters guilty pleas to all charges: 51…”
- Tarrant pleads guilty, Mar 26
Day 531 · August 27, 2020
Tarrant sentenced to life without parole
Justice Cameron Mander sentences Tarrant to life imprisonment without parole eligibility, the first and only person in New Zealand to receive this sentence.
“Justice Cameron Mander sentences Tarrant to life…”
- Tarrant sentenced to life without parole, Aug 27
Afterward
What followed
- 2019 - Arms Amendment Act passed. New Zealand Parliament passed sweeping gun control legislation on March 21, 2019, banning military-style semi-automatic and automatic weapons. Prime Minister Jacinda Ardern announced the ban just six days after the shooting, making it the fastest gun control response to a mass shooting in a Western democracy.
- 2019 - Christchurch Call to Action. In May 2019, Prime Minister Ardern and French President Emmanuel Macron launched the Christchurch Call, a pledge signed by 17 countries and major tech companies to eliminate terrorist content online. The initiative aimed to prevent the livestreaming and spread of violent extremist material.
- 2020 - Ardern wins second term amid gun control success. Jacinda Ardern won reelection in October 2020, with her decisive response to the Christchurch shooting widely credited as a key factor. Her government's swift and effective policy response became a model discussed globally.
- 2020 - Royal Commission of Inquiry released findings. The Royal Commission of Inquiry into the terrorist attacks released its final report in December 2020, concluding that intelligence agencies had failed to properly assess the threat from right-wing extremism and that the shooter had slipped through security gaps.
- 2021 - National Firearms Register established. New Zealand created a National Firearms Register in 2021 to track all licensed firearms. This represented a major shift in regulatory oversight and was directly recommended by the Royal Commission.
The numbers.
3 numbers that anchor the scale.
By the numbers
The countable parts.
Victims killed
0
Victims wounded
0
Manifesto pages
0-page document distributed online before attack
The visual record.
At the cinema, on the charts.
While the world watched Captain Marvel, Bad Guy topped the charts.
The world it landed in
What was on the radio, the screen, and everyone's mind.
Bad Guy - Billie Eilish
Dominant song globally in early 2019
Someone You Loved - Lewis Capaldi
Chart-topping ballad during the period
Captain Marvel (2019)
Released one month before the attacks
Avengers: Endgame (2019)
Released one month after the attacks
Once Upon a Time in Hollywood (2019)
Major release in July 2019
Game of Thrones
Final season aired in April-May 2019
Chernobyl
HBO miniseries premiered May 2019
Same week, elsewhere
In early 2019, global culture was dominated by Marvel's dominance, the final season of Game of Thrones, and emerging concerns about online extremism and social media's role in radicalization. The Christchurch shooting accelerated these conversations about internet safety and exposed how platforms had become vectors for violent ideology.
Then and now.
3 measurements then and now - the deltas the event left behind.
Then & now
The world the event landed in vs. the one it left behind.
New Zealand gun homicides per 100,000 population
0.45
2018
0.36
2023
Data from OECD and New Zealand Police
Semi-automatic weapons in civilian hands in New Zealand
approximately 1.5 million
2019
fewer than 200,000
2023
Estimated based on buyback program results
New Zealand's global gun ownership ranking
15th highest per capita
2018
22nd highest per capita
2023
Small Arms Survey data