A short distance away, 39 people were being treated in hospital for gunshot wounds and other injuries inflicted in the massacre.
The footage shows him returning to the mosque, shooting a woman outside, and getting back in his vehicle. And a victim in one of the shootings died on the way to the hospital.
Ardern said the investigation was ongoing but authorities believed there was only "one primary perpetrator". "I thought I'm gone as well".
Tarrant wrote of Muslims as "invaders", and defined the goal of his attack as "to show the invaders that our land will never be their land", and that "our homeland" will remain as long as white people survive. He has not been publicly identified by officials.
"This is one of New Zealand's darkest days", said Prime Minister Jacinda Ardern. She called the shootings a terrorist attack, one that appeared to have been well planned.
"My message was sympathy and love for all Muslim communities", she said.
In a letter to the prime minister of New Zealand, Modi also stressed India's strong condemnation of terrorism in all its forms and manifestations, and of all those who support such acts of violence. "We were chosen for the very fact that we are none of these things". "We represent diversity, kindness, compassion, a home for those who share our values, refuge for those who need it. And those values, I can assure you, will not, and cannot, be shaken by this attack".
In addition to the dead, she said more than 20 people were seriously wounded. "Our city has changed forever today", Mayor Lianne Dalziel said in a statement. Heba told the Dubai-based news outlet that she lost five family friends, including a 12-year-old boy, in the attack. The manifesto also claimed U.S. President Donald Trump and American alt-right commentators as inspiration.
This is the worst mass shooting in New Zealand's history.
New Zealand will ban semi-automatic rifles, Attorney-General David Parker said on Saturday and was greeted loudly by a crowd here on vigil after the horrific killing of 49 people in Christchurch shootings.
"This is a time of distress, we are in disarray, we don't know why this has happened", he said.
Law enforcement officials in other cities across the country, including NY and Los Angeles, have also said they are increasing security forces at mosques in response to the shooting.
"The City of Pittsburgh will protect all houses of worship and the right to freely and safely practice your religion without fear", Public Safety said in a release. "Prayers go out to the victims and families whose lives have forever changed because of this senseless attack".
The attack has been condemned across the globe, with leaders from Pakistan, Turkey, Britain, Germany, Israel, Jordan, Japan and the European Union sending their condolences and offering support to New Zealand. If the shooting had started mid-prayer, he said, he thinks the death toll would have been higher. Tarrant, who posted an anti-immigrant manifesto online and apparently used a helmet-mounted camera to broadcast live video of the slaughter in the city of Christchurch, appeared to make a hand sign, similar to an OK sign, that is sometimes associated with white nationalists.