Make sure that your instructor, supervisor, or other reliable person has been advised prior to leaving the area that you are still in the building and where you are. They then, should notify arriving firefighters or police officers. Fire and or police personnel will come to your location, and, either assist you in evacuation, or, provide you information regarding the necessity of any further action for your personal safety. If the stairway becomes smoke filled or unsafe before the arrival of emergency personnel, move back into the building and proceed to another usable stairway. If no phone is available, try to wave a coat or similar large object out a window to gain attention.
Crime comes in many forms and occurs in many places.
What may seem just an unusual activity may actually be a crime in progress or someone preparing to commit a crime. Because of this it is hard to say what may need to be reported to the police and what is a normal occurrence. It might be anything from someone looking in a car window, someone taking a book bag off a desk or an unusual noise. It might not even seem police related, such as a water leak or a dangerous condition near a building or in a parking lot. If the police are not responsible for the issue they will forward the report to the proper department to handle the situation.