Before attacking Jay Z in a Standard Hotel elevator, Solange Knowles reportedly yelled at designer Rachel Roy, Dame Dash’s former wife, during a Met Gala after party May 5, according to UsWeekly

The publication cites a source who says Beyonce “got in the middle of it,” however the report says the reason for the yelling is unknown. Another source says Solange yelled at various people in a group that included Roy. Two years prior to this alleged confrontation, Solange and Roy attended the Met Gala together, the report says. 

Another source says Solange was yelling about Jay Z.

“Solange was yelling that anyone who gets close to Jay has to be warned and deal with her as a sister,” the source says to UsWeekly.

As Jay Z, Beyonce and Solange were on their way to exit the event, Jay Z reportedly said something to Solange in the elevator. 

“Solange flipped out over something Jay had said, that she took the wrong way,” the publication’s source says. “She took it too hard or too far. Not sure what it was, but she greatly overreacted.”

This was echoed by another source the publication cites.

“Jay said something small to her along the lines of, ‘You are out of line,'” another source says. “Solange was being a loudmouth and snapped at Jay trying to calm her down and get her out of there.”

Another source says Beyonce tried to remain out of the problem. 

“She does not approve of violence,” the source says. “They are trying to put the situation past them now.”

Jay Z, Solange and Beyonce have not commented on the matter.

Yesterday (May 13), another report claimed to have a source who knew the cause of the altercation. As reported, the New York Daily News spoke with a source who claimed Solange attacked Jay Z because the rapper planned on attending Rihanna’s Met Gala after-party without Beyonce.

As reported, Jay Z and Solange allegedly went shopping for jewelry together yesterday (May 13). 

To view footage of the altercation, click here

(May 14, 2014)

UPDATE: Solange’s May 5 confrontation with designer Rachel Roy, Dame Dash’s former wife, was about Jay Z wanting to attend a Rihanna after-party at Up & Down, according to a report in Daily News.

The story says Solange believed Roy was going to be at the event and that Solange thought that Jay Z was getting “too close” to his former business partner’s ex-wife.

RELATED: Jay Z Attacked By Solange Knowles, Additional Footage Released