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.
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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.
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The attack was broadcast live on social media, prompting the Christchurch Call, an international initiative to limit the spread of violent extremist content online.
