"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

Christchurch shooting is one of the worst on record.

A Christchurch resident revealed he was sleeping when he woke up to 20-40 gunshots.

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.

Canterbury DHB chief executive David Meates said today that 30 people remained in Christchurch Hospital, including nine people in a critical condition in intensive care.

Police deputy commissioner Wally Haumaha gives update on Christchurch shooting

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