He told us what he was going to do: that's the stark conclusion of two extremism researchers who've uncovered previously unreported public communications from the Christchurch terrorist in the years leading up to the 2019 March 15 attack.

Researchers Chris Wilson and Michal Dziwulski say the Royal Commission into March 15 failed to ask some of the most important questions after the attack - and whether it might have been prevented - and reached conclusions about Brenton Tarrant that were not supported by evidence.

Join Jack Tame and the Q+A team and find the answers to the questions that matter. Made with the support of NZ on Air.