Video:Jay Z Attacked By Beyonce’s Sister Solange Knowles

American rapper Shawn Corey Carter popularly known on stage as 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.  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, screaming at Jay before unleashing a violent attack.Watch the video below..

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.

Nepicity.com gathered from YouTube that it's unclear what triggered the fight.  When you look closely, you see the bodyguard hit the emergency stop switch on the 12th floor  mid fight -- presumably to keep the fight private.