At least 49 people were killed in mass shootings at two mosques full of worshippers attending Friday prayers on what the prime minister called "one of New Zealand's darkest days".
New Zealand's Prime Minister Jacinda Ardern said none of them were on security watch lists.
"The offender was in possession of a gun licence". 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.
"While work is being done as to the chain of events that led to both the holding of this gun licence and the possession of these weapons, I can tell you one thing right now - our gun laws will change", she said.
Prosecutors in Bulgaria launched a probe into a recent visit to the country by the terrorist behind the attack. One man tries to greet him calmly, calling out "Hello, brother".
At a news conference on Saturday afternoon local time, New Zealand Police Commissioner Mike Bush said authorities would release more information on the victims soon.
Toronto police would not confirm any specific steps they are taking but said they are making "appropriate adjustments to our plans in order to mitigate the potential risks to public safety".
The European Commission said the "senseless act of brutality on innocent people in their place of worship could not be more opposite to the values and the culture of peace and unity that the European Union shares with New Zealand". "I'm sure this bloody crime doesn't represent the New Zealanders".
Iran's Foreign Minister Mohammad Javad Zarif said bigotry in Western countries contributed to the attacks on Muslims in New Zealand.
It said Conservatives stand with Muslims around the world to "reaffirm our commitment to building a world where every people, of every faith, can live in freedom and peace together".
Australian police are investigating Tarrant's connections around Grafton.
Beyond his white nationalistic views, he claimed to be an environmentalist and said he is a fascist who believes China is the nation that most aligns with his political and social values.
He said when he arrived he found police and made his way past a cordon. "The person who has perpetuated this violence against us is not. Hopefully she will be so much better", he said. He was living in Dunedin, a seaside city south of Christchurch, has traveled around the world and spent sporadic periods in New Zealand. Sure. As a policy maker and leader?
If the document is to be believed, the attack had taken two years to plan and the shooter had chose to target Christchurch several months ago. He said he has donated to many nationalist groups, but claimed not to be a direct member of any organisation. The father in the family was killed, one son was wounded and another was missing, he said, citing information he had received from a friend of the family.
The attack has had the opposite impact, with condemnation of the bloodshed pouring in from all quarters of the globe, and calls for unity against hatred and violence.
Tarrant was then seen making an OK gesture - a symbol which has been used by white supremacists.
The victims, he wrote, were chosen because he saw them as invaders who would replace the white race.