Yahoo news:
The fire was set by a contract employee angry about being transferred to Hawaii who tried to sabotage the center that is crucial for air traffic, local broadcaster WGN reported law enforcement officials as saying.
The employee cut himself while cutting wires and also doused lines with gasoline and set them on fire, WGN reported.
Law enforcement officials are planning a briefing later on Friday and were not immediately available to comment.
My flight into Chicago is currently 225 minutes delayed...