CBC News is carefully considering the use of images and video from this attack, and is only using this material sparingly in the interest of helping our readers understand what happened and why.

The death toll in the New Zealand mosque shootings rose to 50 on Sunday after police found another victim at one of the mosques, and Prime Minister Jacinda Ardern said bodies of those killed would begin to be released to families for burial.

Australian Brenton Harrison Tarrant, 28, a suspected white supremacist, was charged with murder on Saturday.

Tarrant, handcuffed and wearing a white prison suit, stood silently in the Christchurch District Court where he was remanded without a plea. He is due back in court on April 5 and police said he was likely to face further charges.

Friday's attack, which Prime Minister Jacinda Ardern labelled as terrorism, was the worst ever peacetime mass killing in New Zealand and the country had raised its security threat level to the highest.

Footage of the attack on one of the mosques was broadcast live on Facebook, and a "manifesto" denouncing immigrants as "invaders" was also posted online via links to related social media accounts.

A police officer stands guard in front of the Masjid Al-Noor mosque in Christchurch, New Zealand, on Sunday. (Vincent Yu/Associated Press)

It is customary in Islam to bury the dead within 24 hours but no bodies have been released because of the investigation, police said.

Arden said bodies would be handed over to families from Sunday evening.

"It is likely, however, to be a small number to begin with," she told a media briefing, adding that all should be returned by Wednesday.

Ardern said police would be posted at all mosques while they are open.

Police Commissioner Mike Bush said the body of the 50th victim was found at the Al-Noor mosque, where more than 40 people died after a gunman entered and shot at people with a semi-automatic rifle with high-capacity magazines, before traveling to a second mosque.

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One man at the second mosque in the suburb of Linwood was being hailed for distracting and confronting the shooter, preventing further deaths.

Abdul Aziz, 48, told media he heard shooting and ran outside the mosque, shouting at the gunman and drawing him away from the building, the Newshub website reported.

Aziz, originally from Afghanistan, said he picked up one of the gunman's discarded weapons and threatened the man, who drove off.

Police then rammed the gunman's vehicle and arrested him. "Those two police officers acted with absolute courage," Bush said. "They have prevented further deaths and risked their own lives to do so."

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 earthquake.

The majority of victims were migrants or refugees from countries such as Pakistan, India, Malaysia, Indonesia, Turkey, Somalia and Afghanistan. Muslims account for just over one per cent of New Zealand's population.

Many still in hospital

Thirty-four people were in Christchurch Hospital, with 12 in intensive care, while one child was moved to a dedicated children's hospital in Auckland.

Greg Robertson, head of surgery at Christchurch Hospital said staff were used to seeing gunshot wounds and severe injuries, but the scale and nature of the attacks was different.

"The magnitude of this is the thing that is the most significant issue for people. It's just comprehending what is the incomprehensible."

Bush said police did not believe that three other people arrested on Friday were involved in the attack. Two men faced charges unrelated or "tangential" to the attack, while a woman had been released, he said.

Tarrant did not have a criminal history and was not on any watchlists in New Zealand or Australia.

In a manifesto emailed out to various people including government leaders, and posted online, nine minutes before the attack began, Tarrant described himself as "Just a ordinary White man, 28 years old" who used the spoils of cryptocurrency trading to finance extensive travels through Europe from 2016-2018.

Watch as eyewitness says he escaped as shots began:

An eyewitness of one of two Christchurch, New Zealand, mosque shootings says he escaped through the side door as the gunman opened fire. Mohan Ibrahim has lived in the country for five years, but says after the attack, he does not feel safe. 14:59

Spotlight on gun laws, social media

The shootings have raised new questions about violence being disseminated online.

Ardern told the briefing that she had been contacted by Facebook operations chief Sheryl Sandberg who had acknowledged what had happened.

"This is an issue that I will look to be discussing directly with Facebook," Ardern said.

Facebook said on Twitter it had removed 1.5 million videos of the attack in the first 24 hours and it was also removing all edited versions, even those without graphic content.

The violence has also shone a new light on gun control.

Ardern said Tarrant was a licensed gun owner who allegedly used five weapons, including two semi-automatic weapons and two shotguns, which had been modified.

"I can tell you one thing right now, our gun laws will change," Ardern told reporters on Saturday, saying a ban on semi-automatic weapons would be considered.

New Zealand has in the past tried to tighten firearm laws, but a strong gun lobby and culture of hunting has stymied such efforts.

There are an estimated 1.5 million firearms in New Zealand, which has a population of only 5 million, but it has had low levels of gun violence.