New Zealand police and intelligence officers have reportedly raided several Auckland addresses over allegations of a plot to kill Fiji's leader Commodore Frank Bainimarama.

Former Fijian cabinet minister Rajesh Singh has told media he was visited by a woman claiming to be from New Zealand's Security Intelligence Service and three policeman, who took his mobile phone and his daughter's laptop.

The woman said she had "credible evidence" that Commodore Bainimarama's assassination was being planned in Auckland and asked Singh why Fiji Army Colonel Tevita Uluilakeba Mara had visited him, 3News reports.

Singh said he was friends with Colonel Mara but he did not know of any assassination plots.

The laptop and mobile phone were returned and Singh was told not to talk to media.