Video: Solange Viciously Attacks Jay Z in a New York Elevator, as Beyonce Looks on.

News broke early today of a leaked video showing Solange Knowles, Beyonce’s younger sister viciously attacking Jay Z in a New York elevator. While it is unclear the reason for the altercation, see the video and TMZ.com report after the cut.

Jay Z was ferociously assaulted by Beyonce’s sister, Solange….. who was wildly kicking and swinging at him inside an elevator…. And the attack was captured on surveillance video… obtained by TMZ.

According to our sources, it all went down at a Met Gala after party last week at the Standard Hotel in NYC. In the video, Jay Z, Beyonce and Solange step into the elevator …… and then Solange goes crazy at Jay before unleashing a violent attack.

A large man – who appears to be a bodyguard – attempts to hold Solange back, but she manages to connect at least 3 times. At one point, Solange throws a kick and Jay grabs her foot, but never attempts to strike her. Beyonce stands by without getting physically involved.

And this is interesting. When you look closely, you see the bodyguard hit the emergency stop switch on the 12^th floor – mid-flight – presumably to keep the fight private.

At one point, Solange smacks Jay with her purse …. Spilling the contents all over the floor of the elevator

Eventually, the group exits the elevator ….. but not before Solange takes a few last shots.

All three walked out of the building together – Solange looks pissed – but while Bey and Solange get  in one car …. Security walks Jay to a different one.

It’s unclear what triggered the fight