WASHINGTON (AP) — A Washington police officer is under investigation for wearing a T-shirt to court that an advocacy group says has a racist symbol and offensive images.

Local media report the unidentified officer was assigned to desk duty Friday and ordered to have no contact with the public, pending an investigation. Police Chief Peter Newsham called the T-shirt "disgraceful."

The black shirt shows the Grim Reaper holding a rifle under a District of Columbia flag. Above the image is the word "Powershift" with a cross embedded in the letter "o."

That image is a "sun cross," which advocacy groups say white supremacist groups use in their logos and imagery.

The group Law 4 Black Lives DC has filed a complaint against the officer and posted an online petition demanding his firing.