May 12, 2014 -- Beyonce's sister and fellow singer Solange Knowles is seen allegedly attacking Jay Z in an elevator at a Met Gala party, according to a video posted by TMZ.
The alleged video looks to be surveillance video and the Standard Hotel sent a statement to ABC News on the matter.
"We are shocked and disappointed that there was a clear breach of our security system and the confidentiality that we count on providing our guests," the statement reads. "We are investigating with the utmost urgency the circumstances surrounding the situation and, as is our customary practice, will discipline and prosecute the individuals involved to our fullest capacity.”
The video shows Knowles walking up to the rapper and brother-in-law last Monday after the Met's big event, then punching and kicking him while a bodyguard does his best to hold her back. At the end of the 58-second clip, Beyonce, 32, steps in between the two.
Jay Z, 44, seen in the video wearing in a white tux, which he wore to the Met, does his best to stand away from Solange in the corner of the elevator and just put his hands up in defense. Solange continues to kick him, even with the bodyguard holding her.
Reps for both parties have not responded to requests for comment.