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UPDATE: The ground stop has been lifted

Police officials say the fire at the FAA facility in Aurora, Illinois, this morning was set intentionally.  The fire led to a ground stop that affected hundreds of flights in and out of Chicago's O'Hare and Midway Airports. 

In a press conference this morning, police said the fire appeared to have been set by a contracted employee in the basement of the facility, but it was not a terrorist act.  Two men were found injured including a man with self inflicted wounds believed to be the suspect who started the fire.  The incident is under investigation. 

PHOTO: Getty Images