A gunman attacked worshippers at the Al Noor Mosque and the Linwood Islamic Centre in Christchurch during Friday prayers, killing 51 people and wounding dozens.
Prime Minister Jacinda Ardern's response, including her visit to the Muslim community and her refusal to name the attacker, drew international attention. Parliament passed legislation banning most semi-automatic firearms within a month, supported by all but one member.
The attack was broadcast live on social media, prompting the Christchurch Call, an international initiative to limit the spread of violent extremist content online.
