Police are currently searching for rapper Lil Xan following a violent altercation at a Boston nightclub last week.

The incident occurred early Saturday morning at the Royale nightclub after Lil Xan’s performance. The 28-year-old rapper, whose real name is Nicholas Diego Leanos, was seen in video footage confronting a man in front of the stage. In the video, Lil Xan first swings a microphone at the man and then kicks him in the head.

While the exact cause of the altercation remains unclear, the footage shows a shocked crowd and the victim, who was holding a beer, appeared visibly shaken after the first punch. He stumbles backwards and falls out of sight, but is then kicked in the head by Lil Xan. Despite the attack, the man manages to get back on his feet and leave the stage.

The audience can be heard screaming and trying to intervene as Lil Xan continues to angrily yell at the man. Security quickly escorted the rapper off the stage, but another person in the crowd can be seen arguing with Lil Xan before the rapper yells “Hey, fuck you” at him.

TMZ reports that in a separate video, the victim can be seen knocking over Lil Xan, suggesting the altercation may have been provoked. Despite the violent exchange, the victim refused medical treatment. However, sources claim Lil Xan attacked two other people as she tried to leave the venue.

Police were called to the scene around 1:30 a.m. and are now investigating the incident as assault and battery. Lil Xan, who rose to fame with his SoundCloud hits in the mid-2010s, has yet to be arrested.