A Chicago warehouse fire that started Tuesday night burns again.<br/> <br />Firefighters return to the scene after the fire rekindled.<br/> <br />About 170 firefighters battle the blaze in freezing temperatures.<br/> <br />Water from fire hoses turned the warehouse into an ice castle.<br/> <br />Now the weight of that ice threatens the structure of the building which could collapse.<br/> <br />There's still no word on what caused the fire.
