6abc.com 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 switch to a different circuit. this resulted in some type of malfunction. So far, several high rises (Center Square, Liberty One and Liberty Two) have been evacuated and there are thousands of people on the street. Power has been lost to a number of customers and there's no word when power will be restored. PECO crews are on location trying to fix the problem. All streets from 13th to 18th, Vine to walnut are closed to all traffic for the time being. I know there are Philly girls on here. You may have to find another way home, some of the trains aren't running apparently. I work a block from here-we all heard the explosion, it was BIG!