A renewed terror warning in the U.S. is prompting security concerns in Chicago.
While acknowledging the city may be a potential target, Mayor Rahm Emanuel stresses local and federal agencies are on the lookout for any terrorist activity.
The head of Cook County's Department of Homeland Security says there is no sign of a specific, credible threat against the urban area. But in Chicago airports and across the region security has been heightened.
Former Secret Service special agent Arnette Heintze says Chicago's security apparatus is more than likely in a state of heightened activity, not because of any eminence actionable threat, but due to an increased flow of information from private citizens, alerted by yesterday's bulletin from the US Department of Homeland Security regarding a possible retaliatory lone wolf strike on the homeland.
Cook County’s homeland security chief says the region is prepared to respond.