A Detroit police sergeant who allegedly criticized Beyonce’s Super Bowl halftime show by posting a reference to the Ku Klux Klan is being investigated.

The sergeant, who was unnamed but is reportedly a 17-year veteran of the department, apparently didn’t like the halftime performance — particularly Beyonce’s dancers, who were sporting afros, berets, and dressed in an all-black style similar to the Black Panther party. At one point in the performance, the dancers raised their fists to the sky and made a formation on the field in the shape of an X that, according to the sergeant, was attributed to black activist Malcolm X, WWJ TV .

The sergeant was so displeased with the performance that he took his opinion to his personal Facebook page, saying next year’s halftime show should include the KKK. The post included a photo of Beyonce’s dancers above a group wearing white Ku Klux Klan robes, according to a report by WJBK . It included the text: “So if the dance troupe at the top is ok for this years’ halftime show, then the one at the bottom should be ok for next years’, right?”