

On March 15, 2019, at approximately 1:40 PM local time, Brenton Tarrant, a 28-year-old Australian gym trainer with no previous criminal history 1 who was active on extreme-right internet forums, entered the Al Noor mosque in Christchurch, New Zealand, where he allegedly shot dead 42 people. What was unique about Tarrant’s attack-at least insofar as extreme-right terrorism is concerned-is that he livestreamed his atrocity on Facebook and in doing so, highlighted the Achilles heel of such platforms when faced with the viral dissemination of extremely violent content.

Editor’s note: This article includes a December 28, 2020, addendum with key new details from the December 2020 report of the Royal Commission of Inquiry into the Christchurch attacks.Ībstract: In the space of 36 minutes on March 15, 2019, it is alleged that Brenton Tarrant, an Australian far-right extremist, fatally shot 51 people in two mosques in Christchurch in the deadliest terrorist attack in New Zealand’s history.
