911: Call 911 to report an emergency involving: any crime, medical situation, fire, or
hazardous material incident that is in progress; or any crime that has just occurred and if the suspect is still on the scene, or if there is a possibility of apprehension; and any personal injury accident or any accident including any of the above situations.
311: Call 311 to report non-emergency City service needs, check the status of previous service requests, obtain information regarding City programs or events, and file non-emergency police reports.
Chicago LEPC 
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