The National Basketball Association is facing one of its biggest controversies in years after a team owner was recorded making racist remarks. On the tape, Los Angeles Clippers owner Donald Sterling is heard telling a woman identified as his girlfriend not to spend time with African Americans.

V. Stiviano: “People call you and tell you that I have black people on my Instagram, and it bothers you.

Donald Sterling: “Yeah, it bothers me a lot that you want to broadcast that you’re associating with black people. Do you have to?”

Sterling has faced previous allegations of racial discrimination. In 2009, he paid more than $2.7 million after being accused of driving out people of color from apartment buildings he owns. A former Clippers general manager has also sued Sterling for racial bias. The Clippers players reacted to the controversy on Sunday with a silent protest against Sterling’s remarks. They wore their warm-up jerseys inside out, hiding their team’s logo, and then stacked them in the middle of the floor. NBA Commissioner Adam Silver said the league is investigating.

Adam Silver: “The audio recording posted by TMZ is truly offensive and disturbing, and we intend to get to the bottom of it as quickly as possible. … I think our track record is stellar, and while I understand anger that would be naturally expressed over hearing a tape like this, I also believe that ultimately the players and the rest of the NBA family has confidence that we’ll deal with it appropriately.”

Several current and former NBA stars, including LeBron James, Kobe Bryant, Michael Jordan and Magic Johnson have condemned Sterling’s remarks. James, one of the league’s top players, said: “There’s no room for Donald Sterling in our league.”