Chicago firefighters were called to a report of a fire in a mattress factory in West Garfield Park on Sunday morning, officials reported. About 7:40 a.m. emergency responders first were called to 4444 W. Ohio St. on the West Side for a report of a fire at a mattress factory. The building was evacuated and no one was reported injured, according to tweets from the Chicago Fire Department. The fire later became a two-alarm fire, meaning additional resources were needed. In one tweet, the Chicago Fire Department said water was on the fire, both from a sprinkler system inside the building that activated and from firefighters trying to combat the flames. In another, officials said they were working to ventilate the building. In a tweet just after 9 a.m., officials reported the fire was out and an extensive ventilation and overhaul was in progress. The cause of the fire remains under investigation.