It's hard to imagine anyone assaulting Jay Z, but TMZ has just obtained surveillance footage from a hotel elevator that shows Beyonce's sister Solange Knowles physically attacking her brother-in-law.

TMZ reports that the ferocious altercation occurred at a Met Gala after party in NYC's Standard Hotel in NYC. As you can see in the video, Jay Z, Beyonce and Solange all enter the elevator, when something sets Solange off. Though there is no sound, it appears that she begins yelling at Jay, before swinging her fists and kicking at him. Solange is held back by a bodyguard, presumably, but does connect with a few blows.

Beyonce doesn't get involved in the altercation -- which is kept private when a member of their security team presses the emergency stop button -- and leaves with her sister while Jay departs in another car.

There is no word on what caused the fight.

Solange is Beyonce's younger sister, and also a singer. She has written songs for Bey and Destiny's Child and released her last album, "True," in 2012.

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  • Beyonce And Jay Z

    Jay-Z (L) and Beyonce (R) arrive at the Costume Institute Benefit at The Metropolitan Museum of Art May 5, 2014 in New York. AFP PHOTO/Timothy A. CLARY (Photo credit should read TIMOTHY A. CLARY/AFP/Getty Images)

  • Beyonce

    Beyonce arrives at the Costume Institute Benefit at The Metropolitan Museum of Art May 5, 2014 in New York. AFP PHOTO/Timothy A. CLARY (Photo credit should read TIMOTHY A. CLARY/AFP/Getty Images)

  • Rihanna

    NEW YORK, NY - MAY 05: Rihanna attends the 'Charles James: Beyond Fashion' Costume Institute Gala at the Metropolitan Museum of Art on May 5, 2014 in New York City. (Photo by Dimitrios Kambouris/Getty Images)

  • Kim Kardashian And Kanye West

    NEW YORK, NY - MAY 05: Kayne West and Kim Kardashian attend the 'Charles James: Beyond Fashion' Costume Institute Gala at the Metropolitan Museum of Art on May 5, 2014 in New York City. (Photo by Larry Busacca/Getty Images)

  • Kim Kardashian

    NEW YORK, NY - MAY 05: Kim Kardashian attends the 'Charles James: Beyond Fashion' Costume Institute Gala at the Metropolitan Museum of Art on May 5, 2014 in New York City. (Photo by Larry Busacca/Getty Images)

  • Kim Kardashian And Kanye West

    NEW YORK, NY - MAY 05: Kayne West and Kim Kardashian attend the 'Charles James: Beyond Fashion' Costume Institute Gala at the Metropolitan Museum of Art on May 5, 2014 in New York City. (Photo by Larry Busacca/Getty Images)

  • Michelle Monaghan

    NEW YORK, NY - MAY 05: Actress Michelle Monaghan attends the 'Charles James: Beyond Fashion' Costume Institute Gala at the Metropolitan Museum of Art on May 5, 2014 in New York City. (Photo by Dimitrios Kambouris/Getty Images)

  • Cobie Smulders

    NEW YORK, NY - MAY 05: Actress Cobie Smulders attends the 'Charles James: Beyond Fashion' Costume Institute Gala at the Metropolitan Museum of Art on May 5, 2014 in New York City. (Photo by Dimitrios Kambouris/Getty Images)

  • Kylie Minogue

    NEW YORK, NY - MAY 05: Singer Kylie Minogue attends the 'Charles James: Beyond Fashion' Costume Institute Gala at the Metropolitan Museum of Art on May 5, 2014 in New York City. (Photo by Larry Busacca/Getty Images)

  • Kristen Wiig

    NEW YORK, NY - MAY 05: Kristen Wiig attends the 'Charles James: Beyond Fashion' Costume Institute Gala at the Metropolitan Museum of Art on May 5, 2014 in New York City. (Photo by Dimitrios Kambouris/Getty Images)

  • Stephanie Seymour

    NEW YORK, NY - MAY 05: Stephanie Seymour attends the 'Charles James: Beyond Fashion' Costume Institute Gala at the Metropolitan Museum of Art on May 5, 2014 in New York City. (Photo by Dimitrios Kambouris/Getty Images)

  • Michelle Williams

    NEW YORK, NY - MAY 05: Michelle Williams attends the 'Charles James: Beyond Fashion' Costume Institute Gala at the Metropolitan Museum of Art on May 5, 2014 in New York City. (Photo by Dimitrios Kambouris/Getty Images)

  • Diane Kruger

    NEW YORK, NY - MAY 05: Diane Kruger attends the 'Charles James: Beyond Fashion' Costume Institute Gala at the Metropolitan Museum of Art on May 5, 2014 in New York City. (Photo by Dimitrios Kambouris/Getty Images)

  • Gugu Mbatha-Raw

    NEW YORK, NY - MAY 05: Gugu Mbatha-Raw and designer Alber Elbaz attend the 'Charles James: Beyond Fashion' Costume Institute Gala at the Metropolitan Museum of Art on May 5, 2014 in New York City. (Photo by Dimitrios Kambouris/Getty Images)

  • Janelle Monae

    NEW YORK, NY - MAY 05: Janelle Monae attends the 'Charles James: Beyond Fashion' Costume Institute Gala at the Metropolitan Museum of Art on May 5, 2014 in New York City. (Photo by Larry Busacca/Getty Images)

  • Naomi Campbell

    NEW YORK, NY - MAY 05: Model Naomi Campbell attends the 'Charles James: Beyond Fashion' Costume Institute Gala at the Metropolitan Museum of Art on May 5, 2014 in New York City. (Photo by Dimitrios Kambouris/Getty Images)

  • Jason Wu And Dakota Johnson

    NEW YORK, NY - MAY 05: Designer Jason Wu (L) and actress Dakota Johnson attend the 'Charles James: Beyond Fashion' Costume Institute Gala at the Metropolitan Museum of Art on May 5, 2014 in New York City. (Photo by Dimitrios Kambouris/Getty Images)

  • Benedict Cumberbatch

    NEW YORK, NY - MAY 05: Benedict Cumberbatch attends the 'Charles James: Beyond Fashion' Costume Institute Gala at the Metropolitan Museum of Art on May 5, 2014 in New York City. (Photo by John Lamparski/Getty Images)

  • Amanda Peet

    NEW YORK, NY - MAY 05: Amanda Peet attends the 'Charles James: Beyond Fashion' Costume Institute Gala at the Metropolitan Museum of Art on May 5, 2014 in New York City. (Photo by Larry Busacca/Getty Images)

  • Leighton Meester

    NEW YORK, NY - MAY 05: Actress Leighton Meester attends the 'Charles James: Beyond Fashion' Costume Institute Gala at the Metropolitan Museum of Art on May 5, 2014 in New York City. (Photo by Larry Busacca/Getty Images)

  • Joan Smalls

    NEW YORK, NY - MAY 05: Joan Smalls attends the 'Charles James: Beyond Fashion' Costume Institute Gala at the Metropolitan Museum of Art on May 5, 2014 in New York City. (Photo by Larry Busacca/Getty Images)

  • Reese Witherspoon

    NEW YORK, NY - MAY 05: Reese Witherspoon attends the 'Charles James: Beyond Fashion' Costume Institute Gala at the Metropolitan Museum of Art on May 5, 2014 in New York City. (Photo by Dimitrios Kambouris/Getty Images)

  • Anna Kendrick

    NEW YORK, NY - MAY 05: Anna Kendrick attends the 'Charles James: Beyond Fashion' Costume Institute Gala at the Metropolitan Museum of Art on May 5, 2014 in New York City. (Photo by Dimitrios Kambouris/Getty Images)

  • Lena Hall

    NEW YORK, NY - MAY 05: Lena Hall attends the 'Charles James: Beyond Fashion' Costume Institute Gala at the Metropolitan Museum of Art on May 5, 2014 in New York City. (Photo by Dimitrios Kambouris/Getty Images)

  • Kim Kardashian And Kanye West

    NEW YORK, NY - MAY 05: Kim Kardashian (L) and Kanye West attend the 'Charles James: Beyond Fashion' Costume Institute Gala at the Metropolitan Museum of Art on May 5, 2014 in New York City. (Photo by Dimitrios Kambouris/Getty Images)

  • Isabelle Huppert And Naomi Watts

    NEW YORK, NY - MAY 05: Isabelle Huppert (L) and Naomi Watts attend the 'Charles James: Beyond Fashion' Costume Institute Gala at the Metropolitan Museum of Art on May 5, 2014 in New York City. (Photo by Larry Busacca/Getty Images)

  • Thalia

    NEW YORK, NY - MAY 05: Thalia attends the 'Charles James: Beyond Fashion' Costume Institute Gala at the Metropolitan Museum of Art on May 5, 2014 in New York City. (Photo by Dimitrios Kambouris/Getty Images)

  • Erykah Badu

    NEW YORK, NY - MAY 05: Erykah Badu attends the 'Charles James: Beyond Fashion' Costume Institute Gala at the Metropolitan Museum of Art on May 5, 2014 in New York City. (Photo by Dimitrios Kambouris/Getty Images)

  • Gisele Bundchen And Tom Brady

    NEW YORK, NY - MAY 05: Model Gisele Bundchen (L) and NFL player Tom Brady attend the 'Charles James: Beyond Fashion' Costume Institute Gala at the Metropolitan Museum of Art on May 5, 2014 in New York City. (Photo by Dimitrios Kambouris/Getty Images)

  • Olivier Theyskens

    NEW YORK, NY - MAY 05: Designer Olivier Theyskens (L) and actress Felicity Jones attend the 'Charles James: Beyond Fashion' Costume Institute Gala at the Metropolitan Museum of Art on May 5, 2014 in New York City. (Photo by Larry Busacca/Getty Images)

  • Michelle Williams

    NEW YORK, NY - MAY 05: Michelle Williams attends the 'Charles James: Beyond Fashion' Costume Institute Gala at the Metropolitan Museum of Art on May 5, 2014 in New York City. (Photo by Dimitrios Kambouris/Getty Images)

  • Riley Keough

    NEW YORK, NY - MAY 05: Riley Keough attends the 'Charles James: Beyond Fashion' Costume Institute Gala at the Metropolitan Museum of Art on May 5, 2014 in New York City. (Photo by Dimitrios Kambouris/Getty Images)

  • Taylor Swift

    NEW YORK, NY - MAY 05: Musician Taylor Swift attends the 'Charles James: Beyond Fashion' Costume Institute Gala at the Metropolitan Museum of Art on May 5, 2014 in New York City. (Photo by Dimitrios Kambouris/Getty Images)

  • Olivia Munn

    NEW YORK, NY - MAY 05: Olivia Munn attends the 'Charles James: Beyond Fashion' Costume Institute Gala at the Metropolitan Museum of Art on May 5, 2014 in New York City. (Photo by Larry Busacca/Getty Images)

  • Zooey Deschanel

    NEW YORK, NY - MAY 05: Zooey Deschanel attends the 'Charles James: Beyond Fashion' Costume Institute Gala at the Metropolitan Museum of Art on May 5, 2014 in New York City. (Photo by Larry Busacca/Getty Images)

  • Claire Danes

    NEW YORK, NY - MAY 05: Claire Danes attends the 'Charles James: Beyond Fashion' Costume Institute Gala at the Metropolitan Museum of Art on May 5, 2014 in New York City. (Photo by Dimitrios Kambouris/Getty Images)

  • Amy Adams

    NEW YORK, NY - MAY 05: Actress Amy Adams attends the 'Charles James: Beyond Fashion' Costume Institute Gala at the Metropolitan Museum of Art on May 5, 2014 in New York City. (Photo by Dimitrios Kambouris/Getty Images)

  • Hayden Panettiere

    NEW YORK, NY - MAY 05: Hayden Panettiere attends the 'Charles James: Beyond Fashion' Costume Institute Gala at the Metropolitan Museum of Art on May 5, 2014 in New York City. (Photo by Larry Busacca/Getty Images)

  • Kate Mara

    NEW YORK, NY - MAY 05: Actress Kate Mara attends the 'Charles James: Beyond Fashion' Costume Institute Gala at the Metropolitan Museum of Art on May 5, 2014 in New York City. (Photo by Larry Busacca/Getty Images)

  • Naomi Watts

    NEW YORK, NY - MAY 05: Naomi Watts attends the 'Charles James: Beyond Fashion' Costume Institute Gala at the Metropolitan Museum of Art on May 5, 2014 in New York City. (Photo by Larry Busacca/Getty Images)

  • Rosamund Pike

    NEW YORK, NY - MAY 05: Rosamund Pike attends the 'Charles James: Beyond Fashion' Costume Institute Gala at the Metropolitan Museum of Art on May 5, 2014 in New York City. (Photo by Larry Busacca/Getty Images)

  • Alexa Chung

    NEW YORK, NY - MAY 05: Alexa Chung attends the 'Charles James: Beyond Fashion' Costume Institute Gala at the Metropolitan Museum of Art on May 5, 2014 in New York City. (Photo by Larry Busacca/Getty Images)

  • Charlize Theron

    NEW YORK, NY - MAY 05: Charlize Theron attends the 'Charles James: Beyond Fashion' Costume Institute Gala at the Metropolitan Museum of Art on May 5, 2014 in New York City. (Photo by Larry Busacca/Getty Images)

  • Charlize Theron And Sean Penn

    NEW YORK, NY - MAY 05: Charlize Theron and Sean Penn attend the 'Charles James: Beyond Fashion' Costume Institute Gala at the Metropolitan Museum of Art on May 5, 2014 in New York City. (Photo by Dimitrios Kambouris/Getty Images)

  • Johnny Depp And Amber Heard

    NEW YORK, NY - MAY 05: Actors Johnny Depp (L) and Amber Heard attend the 'Charles James: Beyond Fashion' Costume Institute Gala at the Metropolitan Museum of Art on May 5, 2014 in New York City. (Photo by Larry Busacca/Getty Images)

  • Ashley Olsen and Mary-Kate Olsen

    NEW YORK, NY - MAY 05: Ashley Olsen and Mary-Kate Olsen attend the 'Charles James: Beyond Fashion' Costume Institute Gala at the Metropolitan Museum of Art on May 5, 2014 in New York City. (Photo by Dimitrios Kambouris/Getty Images)

  • Marion Cotillard

    NEW YORK, NY - MAY 05: Marion Cotillard attends the 'Charles James: Beyond Fashion' Costume Institute Gala at the Metropolitan Museum of Art on May 5, 2014 in New York City. (Photo by Dimitrios Kambouris/Getty Images)

  • Sarah Silverman And Michael Sheen

    NEW YORK, NY - MAY 05: Sarah Silverman and Michael Sheen attend the 'Charles James: Beyond Fashion' Costume Institute Gala at the Metropolitan Museum of Art on May 5, 2014 in New York City. (Photo by Larry Busacca/Getty Images)

  • Sarah Silverman

    NEW YORK, NY - MAY 05: Sarah Silverman attends the 'Charles James: Beyond Fashion' Costume Institute Gala at the Metropolitan Museum of Art on May 5, 2014 in New York City. (Photo by Dimitrios Kambouris/Getty Images)

  • Kirsten Dunst

    NEW YORK, NY - MAY 05: Kirsten Dunst attends the 'Charles James: Beyond Fashion' Costume Institute Gala at the Metropolitan Museum of Art on May 5, 2014 in New York City. (Photo by Dimitrios Kambouris/Getty Images)

  • Jake Gyllenhaal And Maggie Gyllenhaal

    NEW YORK, NY - MAY 05: Jake Gyllenhaal and Maggie Gyllenhaal attend the 'Charles James: Beyond Fashion' Costume Institute Gala at the Metropolitan Museum of Art on May 5, 2014 in New York City. (Photo by Dimitrios Kambouris/Getty Images)