Tarrant on Saturday was charged with only one count of murder, though Prime Minister Ardern assured the public that more charges will be added as the judicial process continues.
"The police will do their duty and keep them protected, which is what they need, and no phone contact, they've said you can't contact them", she said.
A 74-page manifesto, believed to have been written by suspect Brenton Tarrant, was posted online and outlined his anti-immigrant motives.
"I have been deeply saddened by the appalling events in Christchurch today", she said.
Police were able to neutralize two devices: an improvised explosive device at one of the mosques and another device found in the suspect's vehicle, which was also rendered safe.
"Love always wins over hate". Kiwis stand united in our love and support for our fellow Muslim brothers and sisters.
"I can't even go to the mosque now because I am scared of that happening again", the 16-year-old told New Zealand television.
Ardern said the cabinet would be briefed on Monday on the aftermath of the disaster and begin discussions "around issues like, for instance, gun policy". Our thoughts and prayers are with the victims and their families.
Muslims pray during a vigil for victims of the mosque shootings in New Zealand, outside city hall in Toronto, Ontario, Canada March 15, 2019.
"We want some confirmation that he is dead, alive or in emergency".
People have also been laying flowers outside of mosques in other parts of New Zealand in solidarity with the victims and their famlies.
Condemning the terror strike, Ardern had described it as a "terror attack" and said it "appears to have been well planned".
Nearby, Akhtar Khokhur leaned on the shoulders of her friend and cried as she held up her cellphone with an image of her husband.
"That is an area in which I am seeking advice", she said.
"We're all gob-smacked, we don't know what to think", Brenton Tarrant's grandmother, Ms Marie Fitzgerald, told Australia's Channel Nine network. The couple was due to fly out Sunday.
Daoud Nabi, a 71-year-old Afghan man, reportedly ran into the line of fire to save fellow worshippers at the Al Noor mosque and died shielding someone else from a bullet. They have not heard from him since.
In addition to this, victims and their families who were working in New Zealand at the time could receive weekly compensation. He had been living in Dunedin, New Zealand, at the time of the attack, was taken into custody by authorities after he targeting the Al Noor Mosque and the Linwood Mosque, both located in Christchurch.
Facebook, Twitter and Google scrambled to take down the gunman's video, which was widely available on social media for hours after the bloodbath.
At least one of the weapons used by Tarrant was reportedly an AR-15 - the same semi-automatic rifle used in a number of mass shootings in the United States, including the 2012 Sandy Hook school killings in CT. He also had more assault weapons in the trunk of his auto, along with what appeared to be explosives.
The shootings have raised new questions about violence being disseminated online. The pre-schooler was praying alongside her father Waseeim at the Al Noor mosque when she was shot at least 3 times.
All of the guns Tarrant used during the attack were purchased legally, according to gun laws and restrictions in New Zealand. In 2015, it had just eight.
To carry out his attack, Tarrant, who first acquired a gun license in 2017, used two semi-automatic weapons, two shotguns and a lever-action firearm.
But subsequent efforts to tighten the laws, including a ban on semi-automatic weapons, have stalled in parliament.