Riverdale star Cole Sprouse denied sexual assault allegations made against him and three of his fellow costars on Sunday.

“Earlier today myself and three other cast mates were falsely accused of sexual offense by anonymous accounts on twitter,” he said. “I take these accusations very seriously, and will be working with the right teams to get to the root of it.”

“False accusations do tremendous damage to victims of actual assault,” he said in another tweet. “Furthermore, I would never seek to silence anybody. I encourage that people look into the accusations themselves, as the events detailed were factually untrue.

Twitter user @Victori66680029 wrote that Sprouse forced her to have sex with him at a party in 2013 when he attended NYU.

Sprouse’s castmate and ex-girlfriend Lili Reinhart also responded to the allegations on Twitter.

“I have always taken sexual assault allegations seriously. But it was proven that this account was created specifically to create false stories about me and my cast,” she said. “I can’t think of something more twisted than lying about sexual assault.”

“I hope and pray that this does not discourage real survivors from speaking out about their experiences,” she wrote.

She was one of three other Riverdale stars accused of assault, along with KJ Apa and Vanessa Morgan. The account that had accused Reinhart of assault later tweeted that the three accusations were made up, tweeting, “Do you see how easy it is to lie and you guys will believe it? Vanessa Morgan and KJ Apa didn’t do jack s–t. You will believe anything.” Twitter users have speculated that the account that accused Sprouse may have been run by this user, or this user used a similar style handle (a woman’s name followed by a bunch of numbers) and accusation to try to prove Sprouse’s innocence. One person even suggested that the accounts were all traced back to the same IP address.

These allegations come days after a young woman accused actor Ansel Elgort of sexual assault when she was 17 and he was 20. Elgort has since denied the allegations.