From MABAS21:

At around noon Matteson FD was dispatched for a possible basement fire on Shannon Drive. On arrival crews reported heavy smoke showing and a working fire response was requested. While crews tried to knock the fire in the basement, it was determined that the fire load was too great and unreachable. A hole was cut into the main level floor to pour water into the basement. A 1st alarm was requested. If you listen around the 2 minute mark, you can hear a second alarm in Glenwood being toned out. Nobody was injured at the scene of the fire.