The bodies of two girls have been pulled from the wreckage following an explosion at a factory. At least three people - including the youngsters, believed to be sisters, have died in the blast at the plant of Horizon Biofuels, which is in Fremont, Nebraska . The city's mayor, Joey Spellerberg, said his "heart hurts" when he announced the tragic developments in a press conference today. The complex recovery mission, hampered by collapsed steel, continues at the biofuels plant, police said. They