The founder of the website 8chan says New Zealand agencies are mostly powerless to monitor and combat controversial online communities.
Shortly before the Christchurch mosque attacks, a so-called manifesto was uploaded on 8chan, an American online bulletin board that allows people to post comments anonymously.
And just days ago, the accused San Diego synagogue shooter also announced his intentions on 8chan. 8chan is one of many anonymous websites known for their racist, extremist ideas.
Speaking to Max Towle from his home in the Philippines, Fredrick Brennan says sites like 8chan, which he left in 2016, have no obligation to share information with countries outside of the US.