The Marine Corps has launched an investigation after a sign at a base movie theater was altered to spell out a racial slur, reports.

A sign advertising a 3 p.m. showing of Black Panther at a Camp Foster in Okinawa, Japan was altered to read: “Phat Black N*gger.”

A Facebook fanpage titled "Air Force amn/nco/snco" posted shots of the sign, and claimed someone sent it to them. They tagged a few pages linked to the Okinawa base and reposted the Marines' response to their inquiry. 

Officials don’t yet have a suspect, and are unsure of how someone gained access to the roof to change the lettering. The Marine Corps released a brief tweet after the discovery saying the message had been removed and the incident was under investigation.

A detailed statement was later posted on their Facebook page. “Please know that the language used is in direct contradiction to the core values of honor, courage, and commitment that we stand for as Marines,” they wrote. “This type of behavior is not tolerated by the Marine Corps. The text has been removed and the incident is under investigation.”