updated 05/13/2014 AT 11:00 AM ET
•originally published 05/13/2014 AT 2:55 PM ET
One thing is clear. Solange was extremely angry when she reportedly attacked Jay Z in an elevator at a Met Gala afterparty on May 5. But what isn’t clear is what caused her to react.
While sources disagree on the details, the situation was apparently heated before Solange, Jay Z and Beyoncé stepped into the elevator.
According to one source, Solange had a run-in with designer Rachel Roy earlier in the night. “Solange was provoked by Rachel,” the source says.
The source also says Beyoncé “intervened with a warning not to talk to her sister,” adding that Jay Z did nothing to stop the alleged confrontation.