A resident of an apartment building alerted officers on patrol in the Brainerd neighborhood that a building was on fire Monday evening, Chicago police said.
Around 9:40 p.m., officers were alerted to a fire in a building located in the 9000 block of South Laflin Street and discovered the rear of the structure was on fire.
Officers entered the building and alerted residents that there was a fire and evacuated the building as the fire began to spread. Chicago firefighters extinguished the fire and were investigating the cause, police said.
Four residents of the building were displaced.