There have been four reports in the past three weeks, all near campus. On Monday, a 14-year-old girl told police a man offered her a ride.
Other reports include a male driver taking a picture of a 16-year-old girl, a man winking and waving at a 12-year-old, and a male driver trying to talk to a 17-year-old and following her for a short distance.
None of the incidents involved abduction or an attempted abduction. All of the girls walked away and the men left the area.
Detectives are not convinced the incidents are related, but want parents to be aware.