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At least six people have died and others remain unaccounted for following a fire in a hostel, New Zealand's prime minister has told local media.

Emergency services were called to the four-storey Loafers Lodge hostel in Wellington just after midnight local time (12:30 GMT Monday).

More than 50 people were rescued from the building, but police said 11 people remained unaccounted for.

PM Chris Hipkins warned the number of dead was likely to increase.

Police added that they could not be more specific on the number of deaths until they could access the building.

The cause of the blaze is still unknown. Fire and Emergency New Zealand (FENZ) said they were treating the fire as suspicious, but police "don't believe it's been deliberately lit", the New Zealand Herald reported.

Arriving at the scene, firefighters found the top level of the building ablaze. By 04:00 at least 20 fire engines had been sent to the blaze.

Local media reports said the sprinklers did not work and officials could not confirm whether fire alarms were working.

FENZ district commander Nick Pyatt described it as Wellington's "worst nightmare".

Mr Pyatt also said the building contained asbestos and urged locals to wear a face mask and keep their windows closed to avoid inhaling smoke,

"This is a tragic event for all involved. My heartfelt condolences go to the loved ones of those who have lost their lives", he said.

Authorities rescued at least five people from the roof of the burning building, while one person sustained serious injuries after jumping from the third floor of the building to escape the flames, local media reported.

One resident, Tala Sili, told national broadcaster Radio New Zealand he saw smoke coming from under his door and opened it to find the hallway full of smoke. He decided to jump out of the window onto a roof two floors below.

"It was just scary, it was really scary, but I knew I had to jump out the window or just burn inside the building," he said.

Loafers Lodge Hostel has 92 rooms in total and caters to both short and long-term guests.

It was designated by New Zealand's Ministry of Social Development in 2011 as an emergency accommodation provider. Official figures show that more than 3,300 households currently live in emergency housing as of February.

Loafers customers range from shift workers like nurses and hospital staff to unemployed and homeless people, according to local media reports.

Several residents are people who have been deported from Australia, with some still unaccounted for.

In comments to local media, Mr Hipkins called the fire "an absolute tragedy" and paid tribute to local firefighters "who have put themselves in harm's way over past hours to get people out of the building and put the fire out".