The Northern Arizona University Police Department is warning students that men have been attempting to enter student dormitories by stating they are maintenance men.
In all three cases students did not allow the men accesses to their rooms.
Police are reporting that all three incidents happened at three separate dormitories with three separate suspects.
The men were not dressed in NAU uniforms and had no identification, which is a requirement for any maintenance worker.
University officials are urging students to ask for identification and if none is offered to call NAU PD or NAU Facilities and Maintenance at 928-523-4227.