Three men have been admitted to a local hospital with burns Tuesday following an explosion due to equipment failure at the Delaware City Refinery. During equipment maintenance, there was a "minor explosion" and three men were burned at 11:30 a.m., said Office of the State Fire Marshal. A spokeswoman for the Delaware City Refining Company said the men were contractors, who were performing maintenace work at the refinery. She disputed that there was an explosion, but did not explain how men were injured. Emergency responders were called out to the refinery and the victims were taken to Christiana Hospital and later the burn unit in Crozer Medical Center in Upland, Pa. The first, a 39-year-old, was burned on his face and arms. He was admitted in critical condition, New Castle County Paramedics said. A 36-year-old man was the second victim, burned on his face and neck. He was listed in serious condition. The third victim was a 22-year-old who sustained burns to his feet, paramedics said. He was in stable condition when paramedics transported him. There was no fire and no damage to equipment, Robert Fox, the Chief Deputy State Fire Marshal said. The last reported explosion at the refinery was in 2015, when a 62-year-old man was burned on his face and neck in a flash fire. The fire's cause was a lack of protocol, deemed a state report. All of the burn victims are expected to survive, the office said.