Exhaust system backfires at Price Waterhouse building on Wacker Drive

December 1, 2012 4:21:30 PM PST
An exhaust system backfired and blew out a window at the Price Waterhouse building at 1 N. Wacker Drive on Saturday.

Several people in the area reported hearing the blast, but no one was injured.

Chicago Fire Department officials say the cause is under investigation.