New Zealand Police arrested four people on 15 March in relation to the attacks, including a woman and a man, after finding a firearm in a vehicle in which they were travelling together. The woman was released uncharged, but the man was held in custody and was charged with a firearms offence. Additionally, a 30-year-old man said he was arrested when he arrived at
Papanui High School to pick up his 13-year-old brother-in-law. He was in
camouflage clothing, which he said he habitually wore. He claimed to be seeking compensation for a wrongful arrest, but no formal complaint was filed. The actions were defended by police, who mentioned the threat level after the massacre and that they had to deal with reports possibly related to the attacks. On 4 March 2020, a 19-year-old Christchurch man was arrested for allegedly making a terror threat against the Al Noor Mosque on an encrypted social media platform
Telegram. Media reports subsequently identified the man as Sam Brittenden, a member of the white supremacist group
Action Zealandia. On 4 March 2021, a 27-year-old man was charged with "threatening to kill" after making an online threat against both the Linwood Islamic Centre and the Al Noor Mosque on
4chan. The suspect was granted name suppression and remanded into custody until 19 March.
Outside New Zealand On 18 March 2019, the
Australian Federal Police conducted raids on the homes of Tarrant's sister and mother near
Coffs Harbour and
Maclean in New South Wales. Police said the raids were carried out to assist New Zealand Police with their investigations into the shootings, adding that Tarrant's sister and mother were assisting the investigation. On 19 March 2019, an Australian man who had posted on social media praising the shootings was indicted on one count of aggravated possession of a firearm without a licence and four counts of using or possessing a prohibited weapon. He was released on bail on the condition that he stay offline. The man pleaded guilty in
Magistrates Court to four counts of possessing a prohibited weapon. A 24-year-old man from
Oldham,
Greater Manchester,
United Kingdom, was arrested on 16 March for sending Facebook posts in support of the shootings. On 20 March, an employee of Transguard, a company based in the
United Arab Emirates, was fired by his company and deported for making comments supporting the shootings. Thomas Bolin, a 22-year-old living in
New York, sent Facebook messages praising the shootings and discussing a desire to carry out a similar act in the
United States with his cousin. Bolin was later convicted of lying to the
FBI for claiming he did not possess any firearms.
Inspired incidents Nine days after the attack, a mosque in
Escondido, California, was
set on fire. Police found
graffiti on the mosque's driveway that referenced the shootings, leading them to investigate the fire as a
terrorist attack. According to Sri Lankan State Defence Minister
Ruwan Wijewardene, an early inquiry indicated that the
2019 Sri Lanka Easter bombings on 21 April were retaliation for the Christchurch attack. Some analysts believe the attacks were planned before the Christchurch attack, and any linkage was questioned by
New Zealand's government—with Prime Minister Ardern saying she was not aware of any intelligence linking the two. A
mass shooting later took place at a synagogue in
Poway,
California on 27 April 2019, killing a person and injuring three others. The neo-Nazi perpetrator of the shooting, John T. Earnest, also claimed responsibility for the fire and praised the Christchurch shootings in a manifesto. He and Tarrant were said to have been
radicalised on 8chan's
/pol/ discussion board. He also unsuccessfully attempted to live stream his shooting on Facebook. On 3 August 2019,
Patrick Crusius opened fire and killed 23 people and injured 22 others in a
mass shooting at a Walmart in
El Paso, Texas, targeting
Mexicans. In a manifesto posted to 8chan's /pol/ board, the suspect expressed support for and inspiration from the Christchurch shootings. Additionally, the alleged shooter described himself as an "eco-fascist". On 10 August 2019, Philip Manshaus
opened fire at a mosque in
Bærum, Norway, and unsuccessfully attempted to live stream it on Facebook. He referred to Tarrant as a saint online and posted an image depicting Tarrant, Crusius, and Earnest as "heroes". The attack resulted in one injury. Manshaus was sentenced to 21 years for the attack and for killing his teenage stepsister, who was found dead shortly after the attack. On 27 January 2021, the Singaporean
Internal Security Department reported it had arrested a 16-year-old Indian Protestant youth under the
Internal Security Act for
plotting to attack the Assyafaah and Yusof Ishak Mosques on the anniversary of the shootings. The youth had produced a manifesto that described Tarrant as a "saint" and praised the shootings as the "justifiable killing of Muslims". Unable to obtain firearms and explosives due to Singapore's strict gun control laws, the youth had instead purchased a machete and vest. On 6 June 2021, Nathan Veltman
drove a truck into a Pakistani Muslim family in Ontario, Canada, killing 4 and injuring another. After his arrest, he cited support for and inspiration from the Christchurch shootings. On 14 May 2022, white supremacist shooter
Payton Gendron killed ten people and injured three others at a
Tops Friendly Markets grocery store in
Buffalo, New York, targeting
African Americans. Eleven of the 13 victims shot were Black and two others were White. He livestreamed the attack on
Twitch and published a manifesto stating that he was inspired by Tarrant and others including Crusius and Earnest respectively. In response, Acting Chief Censor Rupert Ablett-Hampson placed an interim ban on the circulation of Gendron's manifesto within New Zealand. In addition, the
Department of Internal Affairs considered referring Gendron's livestream of the shooting to the
Office of Film and Literature Classification. In Finland on 15 March 2024, on the fifth anniversary of the Christchurch mosque shooting, a
Junior sergeant in the Finnish army, Evita Kolmonen, was arrested for allegedly planning a mass shooting that day at a university in
Vaasa. She stated that the world needed "a mass culling" to put an end to "selfish individualism", "human degeneration", global warming and
conspicuous consumption. Finnish police described her as ecofascist and stated that she had read books by
Friedrich Nietzsche,
Pentti Linkola and
Ted Kaczynski. She had additionally praised
Pekka-Eric Auvinen in internet conversations and had visited the school where Auvinen perpetrated the mass shooting. During the court proceedings, a bomb threat was called against the Court of Appeal of Vaasa hearing her case. Kolmonen was convicted on 15 January 2025 of firearm offense and planning an aggravated crime against life and health and was sentenced to three years and two months in prison.
Meta Platforms apologised after Instagram initially dismissed the complaint, attributing it to a technical error. The youth was charged with "creating a false impression about the existence of threats or danger." The teenager had also published posts with references to White supremacy and
homophobia. He appeared in the
Bunbury Children's Court where he accepted full responsibility and was referred to a diversionary programme for countering violent extremism. == Reactions ==