The question on everyone’s mind today is: what did Jay Z say to Solange?

Surveillance video obtained by TMZ show Beyoncé’s sister attacking the famous rapper in an elevator after the Met Gala.

It’s unclear what triggered the attack.

Greta Van Susteren discussed the video tonight with Mike Walters, from TMZ. Hear his take on the fight in the video above, and read more below, via TMZ:

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 12th floor -- mid fight -- 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.

To see the video, go to TMZ.com.


Beyoncé Surprises Walmart Shoppers

Beyoncé Gets Yanked Into Crowd During Concert

Fan Grabs Beyoncé's Hair During Concert... and Won't Let Go!