It was by far the deadliest shooting in modern New Zealand history.
There was a second shooting at the Linwood Masjid Mosque that Ms Ardern said killed ten people. 49 innocent people have so senselessly died, with so many more seriously injured.
At least 48 people were wounded, some critically.
Police said improvised explosive devices were found.
Prime Minister Jacinda Ardern gives a press conference from Wellington. Credit PA
All mosques in New Zealand had been asked to shut their doors and armed guards posted at them, police said, adding they were not actively looking for any other "identified suspects". Tarrant has spent little time in Australia in the past four years and only had minor traffic infractions on his record.
The gunman targeted the men's prayer room in the mosque and then moved to the women's room. An officer stopped him. We stand together in solidarity with them.
Australian media reported the gunman came from a town in New South Wales, of which Sydney is the capital, and state police later said they were increasing patrols around NSW mosques in light of the Christchurch attacks.
"We stand for an Aotearoa New Zealand which will never condone such violence". Prime Minister Jacinda Ardern has called the shooting an "unprecendented attack of violence". But it has one of the lowest gun homicide rates in the world.
French President Emmanuel Macron denounced the "odious crimes against the mosques of Christchurch in New Zealand" that have so far left 49 dead.
Australian Prime Minister Scott Morrison said one of the men in custody was Australian. Ardern said the country's gun laws will change as a result of the carnage, but she did not specify how.
Christophe Castaner est à Saint-Astier — Dordogne
La journée du samedi 9 mars a été marquée par l'acte XVII de la mobilisation des Gilets jaunes à travers l'Hexagone. Alors que les enceintes diffusaient le tube de Dirty Dancing , Christophe Castaner a embrassé une certaine Clara.
The Archbishop of Canterbury posted on Twitter: "Profound sympathy for the victims and relatives of the New Zealand terrorism".
"They are safe. But they are mentally shocked". In other forums, people discussed Muslim food restrictions as they prepared to drop off meals for those affected.
The attack has been condemned across Peterborough.
Tarrant, in his rambling manifesto, deemed Trump "a symbol of renewed white identity".
"This was a very well planned event", Bush said, adding that the attack may not be limited to Christchurch and urging people to not visit any of the nation's mosques.
"Just pray for comfort and for blessing over the families affected, for Christchurch as a city". "It's unbelievably nutty. I don't understand how anyone could do this to these people, to anyone". A witness named Mark Nichols told the New Zealand Herald that he heard about five gunshots and that a worshiper returned fire with either a rifle or shotgun. He walks back into the mosque, where there are at least two dozen people lying on the ground. After walking back outside and shooting a woman there, he gets back in his vehicle, where the song "Fire" by English rock band "The Crazy World of Arthur Brown" can be heard blasting from the speakers.
Reputed Gambino crime boss gunned down in New York City
The Todt Hill neighborhood is known for its mafia history. "Very surprising, but I guess old habits die hard". According to local media in NY , he took the helm of the Gambino family in 2015, replacing Domenico Cefalu.
A cricket match between New Zealand and Bangladesh scheduled to start Saturday was canceled after the Bangladesh cricket team had a narrow escape.
"On behalf of myself and my country, which devoted a whole year for tolerance, we offer our condolences to New Zealand, the victims' families and all Muslims", he wrote in Arabic on Twitter.
"It is clear that this can now only be described as a terrorist attack". He describes himself in the manifesto as an ethno-nationalist and fascist.
The gunman said he was not a member of any organization, acted alone and chose New Zealand to show that even the most remote parts of the world are not free of "mass immigration".
German Chancellor Angela Merkel said she mourned "with New Zealanders for their fellow citizens who were attacked and murdered out of racist hatred while peacefully praying in their mosques".
Une fusillade dans deux mosquées fait au moins 49 morts — Nouvelle-Zélande
Près du tribunal, le fils de Daoud Nabi, un Afghan de 71 ans qui a été tué dans l'attaque, demande justice: "C'est monstrueux". En ce jour de prière pour les musulmans, la police demande aux fidèles d'éviter les mosquées "partout en Nouvelle-Zélande".