Manifesto written by one of gunman was 'straight out of the white supremacist playbook'.

Wife says she is waiting and praying that he is safe

"It doesn't get any more serious in this country".

"We need to unite against Islamophobia and fascism now more than ever," group posts.

Watching footage of massacre is traumatising and voyeuristic,so don't do it, expert says.

A Hawke's Bay man in Christchurch says post shooting atmosphere "very surreal"

"People in front of us, mowed down by a semi-automatic rifle, just ordinary people."

LISTEN: Dozens feared killed at Christchurch mosque attacks, one in custody.

Prime Minister Jacinda Ardern's first press conference after the Christchurch Mosque shooting. Video / TVNZ

Ardern cancelled her events in New Plymouth as news of the shooting broke.

One officer appeared to strike the person with their gun during the incident.

Support services for Christchurch

The gunman was also wearing a uniform, mosque-goers told a neighbour.

"People were all running and screaming."

"A lot of people have been killed and many are injured," eyewitness says

The Prime Minister has been in New Plymouth.

What you need to know about the shootings at Christchurch mosques.

Raw: Police respond to shooting at Christchurch mosque.

LIVE: Latest update on Christchurch shootings

An eyewitness captured this video of police treating victims at the Canterbury Islamic Centre. Video / Supplied

The grandmother of Brenton Tarrant, charged with murder in the Christchurch terror attack, has spoken out. Video / Nine

Killed Navy diver Zac Yarwood farewelled with spine-tingling haka. Video / Supplied

Earlier: Prime Minister Jacinda Ardern announces gun law reforms

Nathan Smith, a British man who converted to Islam after moving to New Zealand 13 years ago, speaks about his experience during the Christchurch terror attack. / BBC

Raw: Unverified footage of armed man at Papanui High School