Portions of the Kennedy Expressway and multiple Blue Line CTA train stops were closed for at least two hours Monday night when a suspicious briefcase was discovered at the Blue Line's Addison stop on the northwest side. The train line goes to and from O’Hare International Airport.

The case, which was discovered at the CTA platform at 6 p.m., did not contain explosive materials, according to police on the scene. However, wires were seen sticking out of the small case. And police investigated a nearby parked car in the vicinity.

As a precaution, Illinois State Police closed the Kennedy, one of Chicago’s busiest expressways, in both directions for a number of hours. More on Transportation Security? Go to the Security Magazine archives online.