A fraternity at Arizona State University decided to celebrate the national holiday honoring civil rights leader Martin Luther King, Jr., by being overtly racist.

The Tau Kappa Epsilon fraternity at ASU held an unregistered party Sunday and dubbed it an "MLK Black Party," according to CBS5. Attendees wore basketball jerseys, drank from cups made out of watermelons and flashed gang signs for the camera.

The partygoers posted a number of photos on social media. Attendees included the following hashtags on their Instagram posts:

#myboymartin

#hood

#killem

#ihaveadream

#blackoutformlk

All of the people identified in the Instagram photos used by local media have since deleted their accounts.

The fraternity was already on "social probation" at the time of the incident, ASU spokeswoman Sharon Keeler told the Phoenix New Times, meaning it wasn't allowed to have parties.

Patrick Gleason, director of compliance and housing for the national TKE organization, told CBS5 he will meet with the ASU chapter and school officials "to really flush out the details of this incident and get a full scope of what occurred." In the meantime, the university suspended all operations at the fraternity Monday, according to KTAR. An investigation is underway, CBS5 reports.

The Rev. Jarrett Maupin, an area civil rights activist, told KTAR that he was alerted to the party by a black invitee who said guests were instructed to "dress like black people."

"An estimated 80 to 100 people took part in ritualistic racism," Maupin told KTAR. "That's very dangerous especially on a university campus. A cup made out of a watermelon is advanced racism. Dressing up like, quote, 'black people' -- that requires research and is advanced racism. We're not talking about rookie racists."

The fraternity was only reinstated at the university last month. TKE was suspended after some of its members were part of a group of nearly 20 that started a brawl at an apartment complex in November 2012.

If there's any good news, it's that several ASU students whom CBS5 spoke with instantly condemned the fraternity's behavior, calling it offensive and ignorant.

UPDATE, 3:30 p.m.: Arizona State provided a statement to HuffPost condemning the actions of the fraternity: