Police in Oregon are reopening an investigation into an alleged sexual assault by former Vice President Al Gore.

A massage therapist claims Gore groped her in 2006 at a Portland hotel.

Police earlier said the case was closed because there was no evidence, and there's no word why they are reopening the investigation now.

Gore denies the allegations and said he will not comment on every story quote generated by tabloids.

It has been one month since Gore and his wife, Tipper, announced their separation after 40 years of marriage.