Jay-Z turned himself in to police on Thursday evening as authorities sought the rapper for questioning after a stabbing at a New York nightclub. However, Jay-Z maintains he had nothing to do with the attack.

During a party celebrating the release of Q-Tip's new album at Manhattan's Kit Kat Club Wednesday night, music industry executive Lance Rivera (better known as "Un") was stabbed once in the abdomen and once in the shoulder just before midnight and was taken to New York's St. Vincent Hospital. He was released in stable condition under a doctor's supervision early Thursday afternoon.

Jay-Z (real name Shawn Carter) turned himself in to authorities at Manhattan's Midtown South precinct Thursday night after police named the rapper as one of the many people they wanted to question about the stabbing.

Wednesday afternoon, lawyers for Jay-Z told MTV News that he had "nothing to do with" the stabbing and is "cooperating completely with police."

Def Jam Records

(which owns Jay-Z's Roc-A-Fella Records) echoed the statements of Jay-Z's legal team, saying, "Jay-Z absolutely denies any allegations that he was involved in the incident." The label went on to praise Jay-Z's "positive contributions to hip-hop" and wished Rivera a speedy recovery.

Police said that in addition to the stabbing, another 29-year-old victim was punched in the face. Police said they are treating the case as a second-degree assault and that they are looking for two suspects, both described as black men in their 20s. Suspects have not yet been named.

Police would also not name either of the victims, but spokespeople for Rivera confirmed that the exec was taken to St. Vincent's after being stabbed at the club Wednesday night.

Rivera is the head of Untertainment Music, the label he started with the late Notorious B.I.G. Spokespeople for Rivera and Untertainment had no comment on the stabbing.

The incident took place onstage in the V.I.P. area of the club, and

authorities say no weapon has been recovered.

A spokesperson for Q-Tip told MTV News that the former A Tribe Called Quest rapper was being interviewed in the balcony during the fracas and was unaware of what transpired. Party guests Puff Daddy, Lil' Kim, and Lil' Cease had left the club 20 minutes before the incident.

Earlier Wednesday evening, prior to the Q-Tip party, Jay-Z himself held a music industry listening party at New York's Irving Plaza for his upcoming album "Vol. 3... Life And Times Of S. Carter" which doesn't come out until December 28. Jay-Z was joined by Roc-A-Fella cohorts such as Beanie Seigel, Amil, and Memphis Bleek at the party and performed several tracks from the record.

"Life And Times" has made its way to bootleggers and street vendors, and it has been alleged that the dispute at the Kit Kat Club was over the rampant bootlegging of the album. Just before Jay-Z hit the stage at Irving Plaza, manager Damon Dash even went as far as to declare to the

crowd over a microphone, "F*** the bootleggers!"