NEW YORK (Reuters) – An amended lawsuit filed in federal court on Sunday alleges that rap mogul Jay-Z raped a 13-year-old girl with Sean “Diddy” Combs during a party in 2000.

Jay-Z denied the allegations on social media, criticizing the lawsuit and calling it part of an “extortion attempt” by the plaintiff’s attorney. Jay-Z’s lawyers did not immediately respond to a request for comment.

The lawsuit was originally filed in October in the Southern District of New York and did not name Jay-Z as a defendant at the time, although the amended complaint states that Jay-Z was identified as “Celebrity A” in the original statement of claim.

Combs denied all allegations against him, including this one, in October. He is currently in prison on federal charges of human trafficking for sexual exploitation, although he has pleaded not guilty.

The lawsuit alleges that the unnamed girl was drugged and raped by both Jay-Z and Combs at a party thrown by Combs following the 2000 MTV Music Awards in New York.

Tony Buzbee, the Texas attorney representing the girl who filed the lawsuit Sunday, has filed at least 20 civil lawsuits against Combs, accusing him of sexual misconduct.

In an email to Reuters, Buzbee said the lawsuit against Jay-Z “speaks for itself.”

“This is a very serious matter that will be litigated in court,” Buzbee wrote.

Buzbee says in his amended complaint that his law firm previously sent Jay-Z a letter asking for a settlement.

Jay-Z, the lawsuit says, responded to that letter by filing a lawsuit against Buzbee and orchestrating “a conspiracy to harass” against Buzbee and other attorneys at his firm, which the attorney described as an intimidation tactic to get his client to die to silence.

In a social media post, Buzbee said that the alleged rape victim he represents “never asked for a penny” from Jay-Z, writing that “she was simply seeking a confidential mediation.”

Buzbee filed a lawsuit last week against the law firm Quinn Emanuel Urquhart & Sullivan, whose lawyers represent Combs and Jay-Z, accusing the firm’s legal team of harassing his colleagues, his clients and his family.

Quinn Emanuel Urquhart & Sullivan did not respond to requests for comment.

(Reporting by Brad Brooks in Colorado; Editing by Paul Thomasch and Lincoln Feast)