New Zealand Police and security services have raided the homes of Fiji nationals in Auckland in a bid to investigate a plot claim to assassinate Fiji leader Voreqe Bainimarama, New Zealand media reported Wednesday.

Former Fiji Cabinet minister Rajesh Singh told Fairfax NZ News that a woman who said she was from the Security Intelligence Service (SIS) and three plain clothed policemen came to his Auckland home Tuesday and seized his daughter's laptop and his cellphone.

The woman reportedly told him she had credible evidence that an assassination on Bainimarama was being planned in Auckland and asked Singh why Fiji Army Colonel Tevita Uluilakeba Mara had visited him two weeks ago.

They told him they had "credible evidence" that Mara and a New Zealander were planning to assassinate Bainimarama and his attorney general Aiyaz Sayed Khaiyum.

Singh told her he was a good friend of Mara's, but he had no knowledge of any plots, the report said.

The laptop and phone were returned later the same day.

Mara, who is wanted in Fiji on charges of plotting to overthrow Bainimarama, escaped Fiji in May last year and sought refuge with the Tongan royal family.

Several other Fiji nationals told Fairfax they had also had similar visits.

A spokesman for Prime Minister John Key refused to comment, saying "this is an operational matter. We have no comment on security and intelligence matters," media reported.

Singh and others visited were members of a small Auckland-based group, Coalition for Democracy in Fiji, which campaigns for the restoration of democracy.

Mara was in Tonga and could not be immediately contacted, said the report.

Bainimarama seized power in a military coup in 2006.

His own soldiers mutinied in 2000 in a previous attempt to kill him. Eight soldiers died in the attack which saw Bainimarama flee to safety.

In 2007, a Fiji Indian of New Zealand citizenship, Ballu Khan, was arrested in a plot to kill Bainimarama.

Khan was severely beaten, but managed to get out of Fiji and was believed to be living in Auckland, said the report.

Eight other people, including paramount chief Ratu Inoke Takiveikata and former Fiji spy service chief Metuisela Mua, were convicted of the plot and jailed for life.