Investigators are combing through a New York City shipyard trying to find the cause of a fire and explosion that killed one person and injured more than 30 firefighters and medical personnel. Officials said 36 people were injured, most of them firefighters and other first responders, and one civilian died in Friday's blast on Staten Island. A firefighter and a fire marshal were inside the structure when an explosion happened, and both were seriously injured by the shock wave from the blast. Investigators were at the scene looking for clues on Saturday, along with firefighters sent there as a precaution.