Norwegian police have contacted the FBI as part of a probe into a fake nomination of US President Donald Trump for this year's Nobel Peace Prize.
The Norway-based Nobel Committee earlier this week said it had made a police complaint.
Rune Skjold, from Oslo police force's economic crimes unit, on Thursday confirmed reports the FBI was contacted for assistance.
"We are investigating possible forgery of documents," Mr Skjold said, adding he could not offer details or name any suspects.
Forging documents can result in several years in prison, he added.
Mr Skjold said the Nobel Committee had contacted Oslo police about a month ago.
Police had also been alerted last year over a similar suspect nomination for Mr Trump.
A meeting with FBI officials was due next week in Oslo, Mr Skjold said.
Concerning "the nomination of the US president, I can say that we have good reason to believe it is a fake nomination," Olav Njolstad, non-voting secretary of the Nobel Committee, had told Norwegian public broadcaster NRK earlier this week.
Former president Barack Obama was awarded a Nobel Peace Prize laureate in 2009. Source: AAP
Mr Njolstad, who is also head of the Norwegian Nobel Institute, which assists the five-strong award panel in vetting nominated candidates, declined to comment further.
This year the committee received 329 nominations, the second-highest number to date.
Last year's prize went to the International Campaign to Abolish Nuclear Weapons (ICAN).
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