Hales Franciscan High School is in the 4900 hundred block of South Cottage Grove in the Bronzeville neighborhood.
It isn't clear whether the photographs were passed via text, email or social media sites.
A school official determined that a more serious crime may have taken place after speaking with students.
The name of the victim has not been provided to police and there has been no evidence presented to detectives that a crime has been committed.
School officials have not released any comment at this time.
Police released a statement saying, "we take any allegations of this nature very seriously, so Chicago Police Department has requested that the name of the victim be made available as soon as possible allowing a proper investigation to be conducted."