HELSINKI (REUTERS) - A former Miss Finland has accused US presidential candidate Donald Trump of groping her in 2006 when she was representing the country in the Miss Universe beauty contest.

Ms Ninni Laaksonen told the Ilta-Sanomat newspaper that the Republican presidential nominee had grabbed her behind before she appeared on a television show in New York with other contestants.

"He really grabbed my butt. I don't think anybody saw it but I flinched and thought: 'What is happening?,'" Ms Laaksonen was quoted as saying in the newspaper.

The accusation follows a stream of allegations of inappropriate conduct by Mr Trump from other women in the United States, which have put pressure on his campaign as he trails in opinion polls ahead of the November 8 election.

Mr Trump has denied the accusations.

Ms Laaksonen could not be reached for comment on Friday (Oct 28).