Fiji police are relying on a taxi driver to identify the man who delivered a letter on Wednesday allegedly containing threats on the life of Australia's High Commissioner James Batley.
A police spokesman, Atunaisa Sokomuri, has told Fijilive that the taxi driver was identified and brought in for questioning.
He said the taxi driver has been released but will be brought in for identification when needed by police.
Mr Sokomuri said the driver told police that he was hired by a Fijian man a minute's drive from the High Commission and asked to drop a letter with the security at the gate.
Security outside the Commissioner's house and the Commission itself has been beefed up.
In a statement, the Commission said that neither the High Commission nor the Australian Government would be intimidated by threats.