Solange apparently lashes out at her brother-in-law
In the CCTV footage, the trio get into an elevator with another man – believed to be a bodyguard – and Solange, 27, immediately starts lashing out at Jay, 44.
Solange looks as though she’s shouting at her brother-in-law before starting to hit and kick him.
The bodyguard tries to hold her back and seems to press the emergency stop button in order to avoid the incident being seen by the public.
Jay-Z attempts to fend Solange off – although he never strikes her – while Beyoncé, 32, stands by watching without getting physically involved.
The altercation occurred during a Met Ball after party at New York’s Standard Hotel on 5 May.
Afterwards, the trio were photographed walking out of the building before Solange and Beyoncé got into a car together and security walked Jay to another one.
Beyoncé‘s management declined to comment to the BBC, while a spokesperson for the hotel said they’re ‘investigating how the video came to be leaked’.
Watch Solange Knowles appear to attack sister Beyoncé‘s husband Jay-Z in a lift…