Kevin Spacey is being investigated by police for a sexual assault allegation

British police are investigating an allegation of sexual assault made against Kevin Spacey.

An alleged victim claimed today that after being invited to Spacey’s London home for a drink in 2008, he passed out – and woke to find the Hollywood star performing oral sex on him.

The man, who was 23 at the time, told the House of Cards star to stop and ran from the house, he claimed in The Sun.

The alleged victim added that Spacey had said to him: “Don’t tell anyone about this.”

“On 1 November, City of London police referred an allegation of sexual assault to the Metropolitan police service,” a police spokesman said today.

“It is alleged a man assaulted another man in 2008 in Lambeth. Officers from the child abuse and sexual offences command are investigating.”

Though police have not confirmed his identity, the alleged perpetrator is believed to be Spacey.

The actor has repeatedly been accused of inappropriate sexual behaviour this week, since Anthony Rapp accused him of making sexual advances on him when he was 14.

On Sunday, Star Trek actor Rapp said that in 1986, a 26-year-old Spacey invited him to a party at his New York apartment and climbed on top of the child, “trying to get with me sexually.”

In an interview with BuzzFeed, Rapp, now 46, said he managed to flee before the encounter progressed any further.

In response, Spacey wrote on Twitter that he didn’t remember the incident, but apologised for “what would have been deeply inappropriate drunken behaviour.”

The Baby Driver actor added that he was “sorry for the feelings he [Rapp] describes having carried with him all these years,” before saying: “I choose now to live as a gay man.”

In a statement, his representatives have said: “Kevin Spacey is taking the time necessary to seek evaluation and treatment.”

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The current slew of sexual misconduct allegations in Hollywood – and further afield, including the British Parliament – started with accusations against Harvey Weinstein, who has also sought “treatment.”

After Rapp’s story was made public, filmmaker Tony Montana accused Spacey of having sexually assaulted him in 2003, saying: “He put his hand on my crotch forcefully and grabbed my whole package.”

Montana, whose film Overnight was an Official Selection of the Sundance Film Festival, said Spacey – who he recalled seemed to be drunk – then told him: “This designates ownership.”

The filmmaker, who was in his 30s, had to physically get Spacey off him and had PTSD for six months after the incident, he said.

And yesterday, alleged victim Daniel Beal said that Spacey showed him his penis in public when he was 19, before giving him his £5,000 watch to buy his silence.

“He said: ‘It’s big, isn’t it?’ He leaned over and tried to pull my hand towards it,” Beal told The Sun.

He accused Spacey of “grooming”.

Another man, who did not reveal his name, told the BBC he was left traumatised after waking to find Spacey lying on him, in his underwear, with his arms wrapped around him.

The man, who was a teenager at the time, said Spacey’s behaviour during that weekend was “either very stupid or predatory – or maybe a little of both.”

He added: “It seems he was grooming me.

“For me, I never let on that that’s what I was interested in. I never discussed it, nor did I want it.

“I was uncomfortable at best, traumatised at worst.”

Mexican actor Rob Cavazos has also alleged that Spacey approached him in “unpleasant encounters” which he said he would have termed “harassment” if he were a woman.

Cavazos was at London’s Old Vic Theatre at the same time as Spacey, who was the venue’s artistic director for a decade.

He said the American Beauty actor was commonly found at the theatre bar, “squeezing whoever caught his attention.”

Cavazos – who has been in Rush and and Doctor Who – said: “There are many of us who have a ‘Kevin Spacey story’.

“It seems that it only took a male under 30 to make Mr Spacey feel free to touch us.

“It was so common that it even became a local joke (in very bad taste).”

Today, another alleged victim claimed that Spacey had a sexual ‘relationship’ with him when he was a child, before trying to rape him.

Speaking to Vulture, the latest alleged victim – now a 48-year-old artist living in the US with his long-term partner – said Spacey approached him when he was 14.

After three or four sexual encounters and proclamations of love, Spacey invited him over and didn’t tell him he wanted to top him – “he just did.

“I guess he must have come up behind me and yanked down my baggy jeans, and he goes to f*** me and I’m like, ‘No, I don’t want to.’

“And he pushes hard, and grabs me, and starts shoving up against my asshole, and it hurts like a motherf***er.

“I again tell him no, and he tries again.

“I am strong enough, thank God, both somewhere in my brain and in my body, to get him off of me. I’m sturdy, thankfully.

“I throw him off of me and I run crying down the stairs and out into the street and then suck it all up and go have dinner.”

“I always have said: ‘He tried to rape me.’

He added that the actor was “a paedophile and a sexual predator.

“I would call him that to his face.”

He condemned the statement Spacey made about Rapp’s allegations, in which the Usual Suspects actor came out as gay.

“When you look at his statement, you realise also he’s profoundly narcissistic. He thinks this is about being caught that he’s gay.

“And then he is spinning it, right? ‘Oh, people like gays now. So I’ll throw them that. I’ll say I’m gay and I will betray my whole community and do something else that conflates paedophilia with male homosexuality.’

“That’s great,” he added sarcastically. “Thank you for that.

“And that was probably the thing that made me want to talk more than anything else. How repulsive that was.”

The International TV Academy withdrew an honour it was due to give Spacey.

The American Beauty actor was due to be handed the 2017 International Emmy Founders Award on November 20, at a glamorous event in New York.

In the wake of the allegations and Spacey’s response, Netflix also announced that House of Cards would be ending after its sixth season.

A representative for Netflix said on Monday that the streaming company was “deeply troubled by last night’s news concerning Kevin Spacey.”

And Netflix announced the next day that it was suspending production on the show’s sixth season.