New Zealand internet service providers are working together to block any websites with footage of the Christchurch massacre.

Spark, Vodafone, 2degree and Vocus are actively working collectively to ensure the footage is inaccessible to New Zealanders.

NZ ISPs work together to block footage of Christchurch shooting
The telco industry is working together in an attempt to ensure any website housing footage of the Christchurch terrorist attack is inaccessible to New Zealanders.
https://www.reseller.co.nz/article/658896/nz-isps-work-together-block-footage-christchurch-shooting/

Also see:

Australian telcos block dozens of websites hosting Christchurch terror video
A site that explicitly stated it would not host the horrific Christchurch terror video has been blocked by Australian telcos in an “extraordinary” effort to censor dozens of websites.

Telstra, Vodafone and Optus have all confirmed they are actively blocking Australian customers on their networks from accessing websites that hosted the Christchurch terror video.
https://www.theguardian.com/technology/2019/mar/19/australian-telcos-block-dozens-of-websites-hosting-christchurch-terror-video