The fire started in the 2400 block of North Mason in the Belmont Cragin neighborhood at around 2 p.m.
Massive flames and thick black smoke poured from the residential block, as firefighters on ladders attacked the blaze.
Officials said the fire started in one house and spread to others. A total of four houses and a coach house were damaged in the fire.
2 11 for four buildings 2400 block north mason pic.twitter.com/LdmFDuuu66— Chicago Fire Media (@CFDMedia) July 1, 2020
Chicago Fire Department officials said one firefighter is being treated for non-life-threatening injuries. No other injuries were reported in the blaze.
One firefighter being transported for non life threatening injury from 2 11 pic.twitter.com/ALZYWu8pXg— Chicago Fire Media (@CFDMedia) July 1, 2020
Firefighters appear to have put the fire out, and an investigation into the cause is underway.