A former US news anchor has accused Kevin Spacey of sexually assaulting her teenage son.

Heather Unruh told reporters the actor had bought her son “drink after drink” at a restaurant in Massachusetts in July 2016 before allegedly sticking his hand down the 18-year-old’s pants and grabbing his genitals.

It is the latest accusation made against Spacey, who is being investigated by police in the UK over an alleged sexual assault in Lambeth in 2008.

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Ms Unruh told reporters: “To Kevin Spacey, I want to say this: Shame on you for what you did to my son.

“Nothing could have prepared my son for how that sexual assault would make him feel as a man.”

Baby Driver European Premiere – LondonKevin Spacey (Matt Crossick/PA)

She said her son had not reported the alleged assault at the time because he was embarrassed.

He filed a report with police last week, she added.

Nantucket police chief Bill Pittman told the Associated Press that Massachusetts law does not allow them to confirm or deny a report of sexual assault.

Netflix has cut ties with the House Of Cards star and suspended the show’s sixth season indefinitely since allegations first emerged.

They also canned a Gore Vidal biopic which had Spacey starring as the author.

A lawyer for Spacey has been contacted for comment.