The brother of a Christchurch gun massacre victim has revealed he only found out about his sibling's death when he watched the alleged killer's Facebook live stream.

Ramzan Ali escaped from inside the Masjid Al Noor Mosque after hiding behind a bench and was photographed waiting for news outside.

When he saw the terror suspect's live video on Facebook he recognised the body of his younger brother Ashraf, 58.

Ashraf, who lived in Fiji, had been in New Zealand visiting his brother when he became one of 50 victims of the mass shooting, the New Zealand Herald reported.

Ramzan Ali, pictured waiting for news outside Masjid Al Noor Mosque in Christchurch, has revealed he saw his brother's dead body in the alleged killer's Facebook live stream

Recalling the moment he saw the footage, Ramzan said: 'That's him. Straight away I knew.

'Ninety five per cent, I was certain. Five per cent in me was saying he could have survived.'

His brother was recognisable because he was wearing a Fiji rugby shirt, he said.

Ramzan, a food inspector, had escaped through a window during the terrorist rampage inside the mosque.

He was pictured outside the building holding his phone to his ear and seemed to have a spot of blood on his sleeve.

Describing his brother, he said Ashraf was a talented footballer and a businessman who owned a taxi company.

'He will always be with me. I will never be able to forget him,' he said.

Survivor: Mustafa Boztas, from Turkey, revealed he 'played dead' before managing to escape through one of windows of the Al Noor Mosque in Christchurch

Another survivor, Mustafa Boztas, has spoken of how he 'played dead' before escaping by jumping through a window.

The worshipper from Turkey was was wounded in the leg during the massacre and said he survived by pretending that the shot had killed him.

In the live stream, posted online by alleged killer Brenton Tarrant, a man inside a mosque appears to say: 'Welcome brother,' as the gunman approaches.

Tarrant has been charged with one count of murder and appeared at court on Saturday. He was remanded until April 5.

The 28-year-old Australian outlined his fanatical and extreme anti-immigrant views in a manifesto posted online.

Flowers left by residents are seen at a memorial site for victims of the Christchurch mosque attacks at an Islamic Center in Kilbirnie, Wellington

New Zealand Prime Minister Jacinda Ardern speaks at the Parliament Session in Wellington today, vowing never to utter the name of the twin-mosque terrorist gunman

Facebook said it had removed 1.5 million videos of the attack worldwide in the 24 hours after the shootings, 1.2 million of which were blocked at upload.

On Tuesday, it said no-one had reported the video while it was being streamed live, with the first report coming 29 minutes after the broadcast began and 12 minutes after it had ended.

Police said they have completed post-mortems on all 50 victims and have formally identified 12 of them. Six of the identified victims have been returned to their families.

New Zealand's prime minister Jacinda Ardern has vowed never to speak the name of the alleged gunman.

In an impassioned speech to the country's parliament, Jacinda Ardern implored others 'to speak the names of those who are lost, rather than the name of the man who took them'.