DALLAS — The NBA is reviewing 2011 allegations of sexual assault against Dallas Mavericks owner Mark Cuban and the investigation that led to a decision by prosecutors not to pursue the case.

League spokesman Mike Bass said Wednesday the NBA was looking into the matter, a day after a weekly alternative newspaper in Portland, Oregon, reported a woman’s claim that Cuban put his hands down her pants and touched her inappropriately while they were taking a photo at a Portland nightclub.

“The NBA league office is reviewing the 2011 allegations against Mark Cuban and the subsequent findings from the Portland police investigation,” Bass said.

Cuban flatly denied the woman’s allegations and provided a prosecutors’ report detailing the decision not to file charges.

Prosecutors wrote that “there is no evidence to corroborate the complainant’s statement and there is evidence contradicting the claim.” The report also said the woman didn’t want to proceed with the allegation.

The Portland weekly’s report included a transcript of Cuban’s phone conversation with a police detective, with the Dallas owner strongly denying the claim.