A giant explosion rocked the Tacony Section of Philadelphia Tuesday night claiming the life of a gas worker. The deadly blast happened as crews were working to patch a high-pressure gas main break. "The street is all blown up," Mayor Michael Nutter said. The dramatic blast sent flames high into the sky, and the moment was caught on tape by an NBC viodeographer at the scene. The body of a PGW employee Mark Keeley was found after the fire was controlled. NBC10 sources say that the worker was only 19 years old. Four other PGW workers and one firefighter were transported to local hospitals, Fire Commissioner Lloyd Ayers said. Three of the gas workers are in critical condition at the Temple University Hospital Burn Unit.