Christchurch: More than 1,000 people evacuated as New Zealand bushfire rages into fourth day

Smoke billows out of the raging bushfire in Christchurch.

Fifteen helicopters and fixed wing aircraft have been despatched to battle the blaze. (Supplied: Christchurch City Council)

More than 1,000 people have been evacuated from their homes and a state of emergency declared in the New Zealand city of Christchurch as a raging bushfire headed into its fourth day.

The fire in the Port Hills district of the city began earlier this week but spread rapidly overnight to cover more than 1,800 hectares, emergency workers said.

At least 11 houses have been destroyed.

"Yesterday we were chasing a monster — we were trying to catch it, and you add in wind and it becomes totally uncontrollable," emergency management spokesman Richard McNamara told Radio New Zealand.

"Yesterday afternoon some of the fire behaviour was some of the worst I've [ever] seen, and I've seen fire behaviour in the western US and Australia."

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Prime Minister Bill English cancelled all his engagements to set off for Christchurch to monitor developments.

"The situation remains very serious," Christchurch Civil Defence Controller David Adamson said.

"Police and the Defence Force have had a huge job overnight with evacuations, the setting-up of cordons around key areas and security patrols of areas that have been evacuated."

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Fifteen helicopters and fixed-wing aircraft, the maximum number that can safely be in the air at any one time, have been despatched amid forecasts for winds that could fan the flames.

More than 200 firefighters are battling the blaze.

A change in the wind direction is predicted for later in the week that will lower temperatures and humidity and could slow the fire's progress, emergency workers said.

A helicopter pilot died on Tuesday after crashing while tackling the blaze.

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Reuters/ABC