The move is seen as part of Ukraine's efforts to reinforce its army as soldiers struggle to hold positions against Russia
"I would like to apologise for the distress that this has caused to those impacted by the tragic events of 15 March," she said.
Corrections Minister Kelvin Davis said that before the mail ban, Tarrant had sent nine letters while in custody: two to his mother and seven to "associates", two of which were stopped by officials.
"The thing is, we've never dealt with a prisoner like this before," he told Radio New Zealand.
Tarrant allegedly opened fire in the packed Al Noor mosque during Friday prayers on March 15, and then travelled across town to continue the carnage in the suburban Linwood mosque, while livestreaming his actions on social media.
He is scheduled to stand trial in May next year on 51 counts of murder, 40 of attempted murder and engaging in a terrorist act.
His case came before the Christchurch High Court on Thursday for a brief hearing on procedural matters, although Tarrant was not required to appear via audio-visual link, as he has previously.
The move is seen as part of Ukraine's efforts to reinforce its army as soldiers struggle to hold positions against Russia
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