"We're hoping that, over time, people will see sense and understand that violence doesn't create any kind of peace or stability".
"The US stands by New Zealand for anything we can do".
At least 41 people were killed at the Masjid Al Noor mosque in central Christchurch while at least seven people died inside the suburban Linwood Masjid Mosque.
Shortly before the attack began, an anonymous post on the discussion site 8chan, known for a wide range of content including hate speech, said the writer was going to "carry out an attack against the invaders" and included links to a Facebook live stream, in which the shooting appeared, and a manifesto.
Prime Minister Jacinda Ardern gives a press conference from Wellington.
"The brutal attack.will never diminish the tolerance and decency that New Zealand is famous for".
"I also pay tribute to the emergency services and volunteers who are providing support to those who have been injured".
New Zealand Commissioner of Police Mike Bush said the attack was a "very well-planned event".
European Commission President Jean-Claude Juncker tweeted that he learned of the attack "with horror and profound sadness".
He expressed grief and shock over the incident and expressed condolences for the victims.
In France, home to western Europe's largest Muslim community, Interior Minister Christophe Castaner ordered regional authorities to bolster security at mosques as a precaution.
He said the mosques in Christchurch and Linwood would be the targets, as would a third mosque in the town of Ashburton if he could make it there. "London will always celebrate the diversity that some seek to destroy".
Pope Francis assured "all New Zealanders, and in particular the Muslim community, of his heartfelt solidarity", the Vatican said. He said he wants the city's Muslims to know that New Yorkers "truly embrace" them and "have their backs".
Police patrols are being stepped up around mosques in Peterborough following the terrorist attack in New Zealand.
"Far too often, Muslims suffer unimaginable loss and pain in the places where they should feel safest", Trudeau said in a statement.
Some of those wounded in the attack were young children, including a five-year old.
Political and Islamic leaders across Asia and the Middle East condemned the killings.
"We stand here and condemn, absolutely the attack that occurred today by an extremist, right-wing, violent terrorist", Morrison said.
In the document, Tarrant also wrote about the attack on mosques.
New Zealand, with a population of 5 million, has relatively loose gun laws and an estimated 1.5 million firearms, or roughly one for every three people.
Lebanon's Hezbollah militant group, which is considered a terrorist organization by Western countries, condemned the "policy of hatred that the United States is feeding around the world instead of prevailing religious values that call for forgiveness".