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A family member has confirmed New Zealand's first death in the tsunami which struck Samoa today.
Acting Prime Minister Bill English said there was a "reliable but unconfirmed report" of the death.
He also said there were concerns for more New Zealanders who were staying at resorts hit hard by the tsunami.
"There are likely to be more New Zealand fatalities," Mr English said.
The Ministry of Foreign Affairs and Trade has confirmed three New Zealanders have also been injured in the tsunami.
Mr English said officials were waiting to hear from the Samoan government what they need before a Hercules leaves for the country.
It is understood that several resorts on the southern coast of Samoa's Upolo Island have been obliterated.
Foreign Minister Murray McCully said there were unconfirmed reports of five deaths on the northern Tongan island of Niuatoputapu. The airport runway was said be littered with large rocks.
He said the Cook Islands had reported limited wave activity and serious damage, but said there was limited communication with the islands in the northern Cooks.
There are no concerns over the Tokelau Islands which were not in the path of the tsunami.
Mr English said there were also concerns about the impact on American Samoa and the Government was liaising with the United States over that.
Mr English said there were no estimates of the number of New Zealanders in Samoa, but there were a lot more than usual because of the school holidays.
He advised New Zealanders in Samoa to register their presence with the New Zealand High Commission in Apia.
The NZ High Commission in Apia said about 100 New Zealanders had registered with it.
It also confirmed that at least three New Zealand holidaymakers had been hurt by the tidal wave.
Interactive map of affected area
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"As far as we can tell though their injuries are not serious or life-threatening," acting High Commissioner David Dolphin told NZPA.