The pictures show teenagers said to be Sturgis Brown High School students bashing on a car with racist symbols and words including "go back to the rez."
It's homecoming week at Sturgis and the football team will play Pine Ridge on Friday evening.
A post from the Sturgis Police Department says bashing a car is a homecoming tradition but the event is no longer sponsored by the schools.
Thursday afternoon, the school district told KELOLAND's Julie Dunmire that the homecoming parade scheduled for Friday afternoon is cancelled. The school board plans to meet in executive session Thursday evening to discuss what to do about the other homecoming events.
The chairman of the Cheyenne River Sioux Tribe issued a statement Thursday afternoon, asking for the students involved to be punished.
KELOLAND's Julie Dunmire talks with school officials about the incident and why they are addressing it with students on KELOLAND News at 6.
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The Sturgis Police Department and Meade School District are looking into disturbing photos circulating on social media. The incident has already prompted one homecoming event to be cancelled as the school board considers what to do about the other festivities.