CHICAGO – Chicago police officers on patrol in Brainerd helped evacuate residents from a burning building Monday night after being alerted to the fire by a passerby.

The fire broke out around 9:40 p.m. in the 9000 block of South Laflin Street.

Officers canvassed the area and found the fire spreading to the back of a building, police said. Officers entered the building, knocking on doors and warning residents to evacuate. All residents were able to exit the building safely and no injuries were reported.

Chicago Firefighters arrived on the scene a short time later and were able to extinguish the fire.

An investigation is underway to determine the cause of the fire. Following the fire, four people were displaced.