Tarrant reportedly made a "white power" hand gesture during his court appearance.
Tarrant lived in Dunedin, on New Zealand's South Island, and was a member of the Bruce Rifle Club, according to media reports which quoted club members saying he often practiced shooting an AR-15, which is a lightweight semi-automatic rifle.
Bush told a news conference that the investigation into Friday's attacks are wide ranging and ongoing.
During the hearing, Judge Paul Kellar in the Christchurch District Court said it was "reasonable to assume" that the man would face further murder charges.
"We have had patients with injuries to most parts of the body that range from relatively superficial soft tissue injuries to more complex injuries involving the chest, the abdomen, the pelvis, the long bones and the head", Roberson said. The shock was exacerbated by the fact Tarrant livestreamed his actions from a camera mounted to his helmet, sparking anger at social media platforms and the length of time it took them to remove the videos.
"My heart breaks for the victims of the horrific attack in New Zealand".
Highlanders-Crusaders match called off following Christchurch terror attacks
"Our other key priority is making sure that those people so horribly affected by these events get the support and welfare that they need", the New Zealand Police said in a statement. "I still don't know where he is", she said.
New Zealand's Prime Minister Jacinda Ardern said that the country's firearms regulations would change following the violent attacks on two mosques in the city of Christchurch. She said the main perpetrator used five weapons during his rampage, including two semi-automatic weapons and two shotguns, which he was legally licensed to own.
When asked what he thought of the prime minister suggesting there should be a change in New Zealand's gun laws, the police commissioner said he was "happy to hear" that.
She said neither the gunmen nor the suspected accomplices were on any terrorist watchlist in New Zealand or Australia.
At first, Mr Taylor and his colleagues had no idea what was happening, initially believing the alarms, sirens and general panic sweeping through the New Zealand city were signs of another quake, similar to the 6.2-level seismic disaster that destroyed massive swathes of the city in 2011. A four-year-old girl has been transferred to the Starship Hospital in Auckland.
Police presence in Christchurch and around the country was heightened while families arrived to streets near the mosques with tributes for the victims.
The attacks took place during Friday prayers. "Blood was everywhere and there was chaos", he said.
"We are happy and grateful that the police are taking preventative steps, proactively coming forward to help us ... it's more of a reassurance to the community that we're looking forward". For many, this may not have been the place they were born.