From: CNN ImageSource on Tue, May 26 2009 10:54 PM

## Shot 09/21/2006. ## PHILADELPHIA - September 21, 2006 - An underground explosion in Center City has led to the evacuation of several buildings. It happened around 1:30pm near 16th and Chestnut streets. Apparently, there was an underground cable fault when PECO was attempting to swit...