Christchurch mosque threats: Blocking 4chan website used by white supremacists should be priority - expert 7 Mar, 2021 12:01 AM 2 minutes to read A 27-year-old man appeared in court on Friday charged with threatening to kill worshippers at two mosques in Christchurch after allegedly making threats on online platform 4chan. Photo / 123rf RNZ Intelligence agencies in New Zealand are being urged to do a better job at blocking a website commonly used by white supremacists. It comes as a warning from intelligence expert Paul Buchanan, who says a ban on the website 4chan is not foolproof, after a threat aimed at two Christchurch mosques was posted on the site this week.