The 36 people who had been injured also included two Indian nationals and two persons of Indian origin.
Prime Minister Jacinda Ardern has promised changes to gun laws in New Zealand in the wake of the attack.
Commissioner Bush said that several others have been arrested in connection with the terror attack, although they do not yet face charges. That makes New Zealand's per capita rate of gun ownership higher than Australia's, but still far below the U.S., where there is more than one gun per person.
He has been charged with one count of murder - with more charges expected to follow.
"Those two police officers acted with absolute courage", Bush said.
New Zealand's prime minister, Jacinda Ardern, has already foreshadowed a review of what was known - or should have been known - about the behaviour of Brenton Tarrant. He had been living in Dunedin, New Zealand, at the time of the attack, was taken into custody by authorities after he targeting the Al Noor Mosque and the Linwood Mosque, both located in Christchurch.
All injured are undergoing treatment at Christchurch Hospital.
Police said the alleged shooter was arrested in a auto, which was carrying improvised explosive devices, 36 minutes after they were first called.
A second survivor, Faisal Sayed, said: "If that hadn't happened, many more would have died and I wouldn't be here now".
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"Just around the entrance door there were elderly people sitting there praying and he just started shooting at them", Mazharuddin told Sky.
Aziz, originally from Afghanistan, ran outside after the shooting started and picked up a shotgun that the gunman had dropped.
Church services for victims of the attack were held around the country, including at Christchurch's "Cardboard Cathedral", a temporary structure built after much of the central city was destroyed in a 2011 quake.
Ultimately, Shaukat Khan, 49, was heartbroken to learn of the death of Naeem Rashid, 50, and Rashid's son Talha, 21.
The Pacific Music Awards organisation in New Zealand also expressed its shock and solidarity over the shootings.
At a press conference in Wellington on Sunday, Ardern said she would discuss tightening gun access with her cabinet on Monday, and planned to "verify" information that some New Zealanders were stockpiling weapons.
"It is clear that this can now only be described as a terrorist attack", said Ardern.
Specialist teams would be at Christchurch schools and early learning centers, and support lines were also available to anyone who needed it, Ardern said.
In Sydney, a silver fern - the symbol of New Zealand - was projected onto the side of the world famous Opera House.
Some of the guns appear to have been modified to make them more deadly, she said, adding that a ban on semi-automatic weapons would be considered.