The Los Angeles District Attorney’s office has confirmed that actor Ed Westwick is under investigation for alleged sex crimes. Four women have accused the former Gossip Girl star of rape or sexual assault.

“I can confirm that a case was presented to our office involving Ed Westwick,” a spokesperson for the DA’s office told Deadline. “The matter is under review. The District Attorney’s office does not identify victims of sex crimes and, therefore, cannot provide any information on who the allegations involve.”

The former Gossip Girl actor vehemently has denied the allegations in two separate postings on his Twitter account. Those denials, however, have been removed.

Actress Kristina Cohen, who was the first woman to come forward, claims he raped her three years ago. She says she and her boyfriend were visiting Westwick’s home, where the actor allegedly suggested that they all have sex together. She says she declined the offer and wanted to leave, but her boyfriend, not wanting to make their host “feel awkward,” asked her to stay just a little while longer, and Westwick suggested she take a nap in the actor’s guest bedroom. She says she agreed and soon fell asleep, but awoke with Westwick on top of her. “I told him to stop, but he was strong,” she wrote on Facebook. “I fought him off as hard as I could but he grabbed my face in his hands, shaking me, telling me he wanted to f*ck me. I was paralyzed, terrified. I couldn’t speak, I could no longer move. He held me down and raped me.”

After her allegation came to light, Westwick tweeted: “I do not know this woman. I have never forced myself in any manner, on any woman. I certainly have never committed rape.” That tweet since has been deleted.

A call to the actor’s publicist was referred to his attorney, Larry Stein, who did not return calls.

A few days after Cohen came forward, former actress Aurélie Wynn, whose stage name was Aurelie Marie Cao, made a similar claim, alleging that Westwick raped her after she fell asleep in a spare bedroom following a party.

After that, Westwick tweeted: “It is disheartening and sad to me that as a result of two unverified and provably untrue social media claims, there are some in this environment who could ever conclude I have had anything to do with such vile and horrific conduct. I have absolutely not, and I am cooperating with the authorities so that they can clear my name as soon as possible.” That tweet also has been removed.

A few days later, Rachel Eck alleged that Westwick sexually assaulted her at a Hollywood hotel the night before the 2014 Academy Awards. She told BuzzFeed that she rebuffed his attempts to kiss her several times, and at the end of the evening, he “pulled me onto the bed and aggressively groped me. I shoved him off as quickly as I could and left.”

Earlier this month, the Daily Mail reported that a fourth woman, hair stylist Haley Camille Freedman, claimed in court documents that the actor repeatedly raped her and held her captive at his home for two days after she met him on a night out.

The BBC has dropped Westwick from its drama series Ordeal by Innocence and halted his appearance in White Gold.