The girl, who attended the St. Benno high school, was found around 8:30 am in a Johannstadt district apartment, a police spokesperson told the paper.
Authorities are now searching for a suspect that they believe may have been involved in the crime. Sources at her school told the paper that the suspect was the victim's boyfriend. More information on the events leading up to the murder will be revealed in a statement on Friday, police said.
According to the paper, officials at the university-track school were informed of the student's death on Wednesday. Students had planned to perform an Advent concert that evening, but held a prayer service for the victim instead.
Ministers have been made available to counsel the students, and classes for the students in the victim's grade were cancelled on Thursday, the paper said.