Cyclone Evan has wrecked homes, brought down trees and caused flooding across Fiji's main island.

The biggest cyclone in 20 years to hit the Pacific island nation is believed to have been destroyed a number of homes in Fiji’s second largest city, Lautoka, in western Viti Levu.

Tonight power was cut and land and mobile phone lines went down, but before they were lost, there were reports of major damage.

On the northern coast of Viti Levu, flood waters hit Ba, Raikiraki and Tavua.

In Suva Harbour, two container ships have run aground and are struggling to stay afloat as they’re pounded by rough seas, coinciding with a 10pm high tide.

There were no reports of death or injury.

By 11pm the cyclone had moved south of Nadi and winds in the area have eased, MetService said.

Storm-force winds were still forecast for Fiji, though these are expected to ease overnight, and by the morning the cyclone will have moved south of the country, meteorologist Bill Singh said.

It was still too early to predict if the storm would reach New Zealand, but early models say the tail-end of the cyclone, a deep low, could reach the upper North Island on Saturday, he said.

The Fiji Times reported police officers across Fiji had restricted the movement of people in and out of the main towns and cities until 6am tomorrow, to protect businesses from those who may want to take advantage of the situation.

Tourist resorts on many of Fiji’s palm-fringed islands were evacuated and authorities set up more than 60 evacuation centres.

Before phone contact was lost, Wellington lawyer Janet Mason said the upper part of her house in Lautoka had been destroyed.

She had said the weather was extreme and dramatic.

She said an empty house had flown through the air and landed beside hers.

"Another house has completely disintegrated, its roof is in the trees."

Debris is everywhere and much of it is flying through the air.

"Everything is going, all the trees are being destroyed, there will be nothing left."

In her own home, the roof was coming off and she was losing windows.

"It's really bad, it never stops. The wind is howling so strong and it is raining, except the wind is so strong you cannot see the rain.”

Fiji Times editor-in-chief Fred Wesley said Lautoka city looks like a war zone.

“It's something a lot of people there never expected. They didn't expect the cyclone to hit them to that extent," Wesley said.

"According to people on the ground ... they have never seen anything like this.

"Very, very strong winds, waves, rain, but I think what's worrying was the very, very strong winds," he said.

"For buildings to lose their roofs like that, it's a reflection of how powerful the cyclone was."

So far there had not been any reports of casualties as a result of the storm.

A massive clean-up was expected.

"We are waiting for this to go before we start moving around, but from the reports that we've managed to get from our teams on the ground this is not looking good at all," Wesley said.

Fiji police tonight imposed a curfew across Viti Levu in a bid to stop any movement of people.

Fiji authorities have lost contact with the areas of Levuka and Kadavu.

In the capital, Suva, a container ship and a bulk carrier were struggling to stay afloat in wave surges of up to five metres and while the immediate concern is for their crews, any shipwreck would pose an environmental disaster.

Both the 14,000 ton bulk carrier ship Starford and the Singapore-flagged Capitaine Tasman, 9725 tons were at anchor while aground but appeared to be struggling without any help from tugs.

Photos show the stranded Capitaine Tasman is heavily laden with containers. She appears closest to shore.

Cyclone Evan, which has already wrought WST$300 million (NZ$157 million) damaged and left four people dead and 12 missing in Samoa.

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