Pictures Foam Covers Street After Explosion At Center City PECO Station December 3, 2016 / 2:50 PM EST / CBS News Fire department Fire suppression covers Juniper Street Foam blankets Philly Street Foam covers the road The explosion at the PECO Waverly sub station prompted the fire suppression system Foam piling up foam Hazmat scene Crews were called to the scene Onlookers gather at the scene Philadelphia Fire Dept Police tape prohibits people from getting a closer look Several 911 calls came in to report explosion sounds coming from the PECO station