The national leadership of the Sigma Alpha Epsilon fraternity says it suspended about two dozen members at Clemson University and removed chapter leaders after the group held a Christmas theme party that raised social tensions at the school.

The "Cripmas" party had students dressed like gang members, wearing red and blue bandanas and T-shirts with images of the late rapper Tupac Shakur.

The national fraternity released a statement Monday saying the party was inexcusable and inappropriate, and it apologized to the campus.

Pictures were posted on social media, causing backlash as black students said Clemson didn't do enough to promote racial tolerance. About 6 percent of Clemson's students are black.

Clemson says the fraternity violated alcohol rules and student conduct codes. It will be on probation until February 2017.