A former Fiji cabinet minister living in Auckland says NZ intelligence officials raided his house this week, saying they were investigating an alleged assassination plot against Commodore Frank Bainimarama.

Rajesh Singh has told Radio Australia's Pacific Beat program a woman who said she was from the New Zealand Security Intelligence Service (SIS) came to his home on Tuesday.

He says police told him fugitive army colonel Ratu Tevita Mara and New Zealand national Anthony Fullman may have hatched a plot to assassinate Commodore Bainimarama and his attorney general Aiyaz Sayed Khaiyum.

"Yes they brought the search warrant, they showed it to me but they didn't give me a copy," he said.

"Because I asked them - under the privacy act they have to show me who reported the matter, and if I can have a copy of the search warrant, and they said it's classified."

Ratu Tevita Mara, who now lives in Tonga, has denied any involvement.

Mr Singh says there was no discussion of any assassination plan when the two men were in the country two weeks ago.

"[The police] said do you know that there was a plot meeting conducted...they were planning to assassinate Bainimarama and Khaiyum?" he said.

"I said look here, I never had this meeting here in this shop and nobody spoke on that nature.

"We were talking about other things, we were talking about rugby league, we were talking about the democracy movement, we were talking about the chiefly system and we never even discussed these things."

He says police confiscated a laptop belonging to his daughter, and a mobile phone, which were later returned.

'Not concerned'

Commodore Bainimarama says he isn't concerned about the alleged plot against him.

The Fijian leader, who is currently in South Korea to open a new Fijian embassy, has told Radio Tarana he says he wasn't aware of developments in New Zealand.

"Well that would not surprise me," he said.

"[It] suggests that is the work of cowards.

"But whether they can come to Fiji to carry it out is a different matter because they're cowards. They can't come to Fiji."

Commodore Bainimarama has also urged New Zealand authorities there to send Ratu Tevita Mara to Fiji the next time he visits.

Aiyaz Sayed-Khaiyum has told the New Zealand Herald he had not known anything about the police searches or an alleged plot until somebody sent him New Zealand media reports about it.

"I have absolutely no idea of it. This is the first I've heard about it," he said.

EDITOR’S NOTE: This story was updated on July 23 to correct the title of Mr Rajesh Singh.

A spokesperson for The Coalition for Democracy in Fiji says "The individuals mentioned are not associated with the Coalition for Democracy in Fiji. And no members of the Coalition for Democracy were ever visited by police.”