Erik Solhiem in an interview claims that there was a bomb attack planned to assassinate him during his visit to Sri Lanka in May 2000 with then-Undersecretary of State Raymond Johansen.
He confirmed that he was briefed about the assassination plans.
Police Security Service, which at that time was named service, was made aware of the threat several days before Solheim travelled to Colombo.
The tip came from people in Norway with knowledge of radical communities in Sri Lanka.
Solheim resigned as a Special Adviser in 2005, when he was minister for environment and development.