Rapper Jay Z was physically attacked by Beyonce’s sister in an elevator — it’s just not clear what sparked the bizarre incident.

TMZ obtained the surveillance video of the altercation, which apparently occurred at a Met Gala after party last week at the Standard Hotel in New York City.

Beyonce’s sister, Solange, can be seen viciously trying to hit and kick Jay Z almost immediately after the elevator doors close. She landed about three hits, according to the video available. A large man, presumably a bodyguard, attempts to control the woman and defuse the situation.

They all eventually left the elevator and strolled past the cameras. Jay Z got into a separate car than Beyonce and Solange.

Watch the wild footage via TMZ below: