Brenton Tarrant is awaiting trial for 51 murders, 40 attempted murders and terror offences
He was allowed to write letter from his prison cell to a man in Russia named Alan
Letter, posted on 4chan, talks of 'great conflict' and could be read as a call to arms
The man accused of killing 51 people at two Christchurch mosques was allowed to send a hand-written letter from his prison cell to a supporter.
New Zealand officials apologised for letting Brenton Tarrant, 28, send the letter warning of a 'great conflict'.
The six-page 'call to arms' was posted this week on the website 4chan, a message-based bulletin which has been used for posts by white supremacists.
Tarrant, who is currently awaiting trial for 51 murders, 40 attempted murders, and engaging in a terrorist act, has been cited as an 'inspiration' by other alleged killers including those in El Paso and Oslo.