In the six-page letter, the accused warns that a "great conflict" is coming and uses language that could be construed as a call to arms.

Brenton Tarrant is accused of carrying out an attack on two mosques in March that claimed 51 lives.

Six people appeared in a New Zealand court Monday on charges they illegally redistributed the video a gunman livestreamed as he shot worshippers at two mosques last month.

A New Zealand judge on Friday ordered that the man accused of killing 50 people at two Christchurch mosques undergo two mental health assessments to determine if he's fit to stand trial.

Australian Brenton Tarrant, 28, a suspected white supremacist, was previously charged with only one murder following the attack and has been remanded without a plea.

Australia will fine social media companies up to 10 percent of their annual global turnover and imprison executives for up to three years if violent content is not removed "expeditiously" under a new law.

The far-right, white nationalist groups called identitarians have come into the spotlight after being linked to the gunman who killed 49 people in a terror attack at two New Zealand mosques.

Some say the ban goes too far and risks lending both the document and the gunman mystique.

The mosque shooting in New Zealand emerged from the same toxic corner of the internet that fuelled massacres in Pittsburgh, Quebec City and Toronto.

The document has been deemed "objectionable" under the country's laws, and officials have asked those who have downloaded it to delete it.