New Zealand police have sent notice to the owner of the Kiwi Farms internet message board demanding the preservation of IP addresses and email addresses associated with posts related to the Christchurch shootings, believed to have been committed by 28-year-old Australian Brenton Tarrant.  

Tarrant used Facebook Live to broadcast the first of two Friday attacks on local mosques that left 50 dead and 50 injured, which was rapidly disseminated across various file hosing platforms and websites, including Kiwi Farms - which received the preservation request on Saturday. 

"At around the time of the shooting there were a number of posts and links posted on kiwifarms.net relating to the shooting and TARRANT," reads the letter from Senior Sergeant New Zealand Police detective John Michael. "We would like to preserve any posts and technical data including IP addresses, email addresses etc linked to these posts pending a formal legal request."

"Could you please advise what legal process you require for this request and also confirm preservation of the data requested pending legal process," the letter concludes. 

The email was verified by journalist Nick Monroe.