Excerpts from the ChicagoTribune.com:

Police are seeking three teenage boys suspected of setting a fire in an aisle at a Family Dollar that quickly spread through the store Saturday afternoon. Three boys between the ages of 13 and about 14 set a fire in one of the aisles of the store  at 2:45 p.m., according to Chicago Police Officer Michelle Tannehill.

The Still-and-box alarm fire in the building, 3401 W. Chicago Ave damaged much of the front of the store, and at one point vented through the roof. One firefighter was taken to Rush University Medical Center in good condition following the fire.

thanks Dan