we'll also carry it on debate can be heard on our news partner, koaa, news radio. >>> happened early sunday morning near 17th and university. ride by mackey auditorium. the victim was walking when the man came up from behind her. tom mustin live in boulder. that victim fought back. >> reporter: karen thank goodness that's the case, or it woo be becoming a much different story. she was walking along this path here north of auditorium when the attack happened. cu police say there have been at least four separate attacks on our around campus since school began four weeks ago. >> it's kind of scary. >> reporter: students at cu boulder on alert after a violent attack on a female student near the mackey auditorium. >> did kind of scare me at first. it was right here, right next to my building. >> reporter: you don't know if you're safe or not. >> reporter: early sunday walking alone. a man came up behind her. once she resisted, he grabbed her shirt and pulled her to the ground. she fought him off and left the scene. right now the department has no leads. >> we know he's described as colleg