No images have emerged from the second mosque.
New Zealand Police Commissioner Mike Bush said it took just 36 minutes from the first emergency call at 1.40pm local time (12.40am GMT) before the suspect was in custody.
Ardern's chief press secretary Andrew Campbell told CNN that the email in a "generic" email account maintained by staff, and was not seen by the Prime Minister.
"It is clear that this can now only be described as a terrorist attack".
"They were rural community cops I understand from Lincoln (a nearby town) who were present here".
The Bangladesh cricket team narrowly avoided being caught up in the shooting while on a bus approaching one of the mosques while in the city for a match, which has since been canceled.
Another two individuals are still in custody as the police continue to determine if they were involved in any way.
In Australia, which is seen as culturally similar to New Zealand and has lively farming and hunting communities, the catalyst for outlawing high-powered weapons was the shooting of 35 people at Port Arthur in Tasmania in 1996.
Des proches de Kurzawa font fuir des cambrioleurs
Comme plusieurs coéquipiers avant lui cette saison, Layvin Kurzawa a reçu la visite de cambrioleurs samedi dernier à son domicile. La maison de Layvin Kurzawa a été la cible d'une tentative de cambriolage , selon les informations du journal L'Equipe .
"I still don't know where he is, " she said.
The death toll stands at 49, and 39 people are being cared for in Christchurch Hospital. One further person later died in hospital.
"Our prayers are with the families of the deceased, the injured and all others impacted by this tragedy".
Several more people were killed in an attack on the Linwood Masjid mosque, about three miles away from Masjid Al Noor a short time later.
Mr Bainimarama also said his government will be working closely with authorities in New Zealand to monitor the welfare of Fijians in Christchurch.
The victims of Friday's shooting included immigrants from Jordan, Saudi Arabia, Turkey, Indonesia, and Malaysia.
Mark Nichols told the New Zealand Herald he heard about five gunshots and that a Friday prayer-goer returned fire with a rifle or shotgun. "I'm not sure how to deal with this". One man tries to greet him calmly, calling out "Hello, brother". "Call it out in our communities, in our societies, in our families, in our friendships, in our workplaces", said Hussen.
"I can't. believe that somebody I've probably had daily dealings with and had shared conversations and interacted with would be capable of something this extreme", Gray told Nine Network television.
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".
Nearly 40 years later, on Friday, he was shot and killed at Al Noor mosque in Christchurch.
"He was professional, he was punctual, reliable.as normal as one person to the next", she said.
The country's national security threat level alert was lifted from low" to "high'.
"Has there been travel to the United States?" Police Association President Chris Cahill backed tighter gun laws, saying the weapons used in the mosque shootings were banned in Australia after the Port Arthur massacre in 1996 in which 35 people were gunned down. Versions of the video reportedly persisted on the sites for hours after the shootings.
Prime Minister Narendra Modi said hatred and violence have no place in diverse and democratic societies, and expressed India's solidarity with the people of New Zealand at this hard time.
In it, he says he was inspired by mass killer Anders Breivik, who killed 77 people in Norway in 2011.
The Muslim Community Center, which operates a mosque on the North Side and schools in Morton Grove and Skokie, said in a statement that it planned to hire extra security patrols and advised its members, "Please be vigilant by keeping your eyes and ears open and being aware of your surroundings".
Political and Islamic leaders across Asia expressed their disgust at the deadly shooting. "I blame these increasing terror attacks on the current Islamophobia post-9/11", Pakistani Prime Minister Imran Khan posted on social media.
'Yellow-vest' rioting in Paris as anti-Macron protests persist
He then travelled the length and breadth of the country, engaging in marathon debates with local politicians and voters. But for seven hours they continued to be pelted with paving stones by mostly black-clad demonstrators.