The rumor was that a cop killed a student indirectly. The policeman was in the hall asking if anyone needed help and a little girl called out saying she did. This allowed the shooter to easily gun down the hidden child before they got to him. A lot of articles had confusing headlines making it sound like a cop shot a student, but in the article that was what was written. So I wouldn't be surprised if people played telephone into saying a cop shot a student.