Authorities say three children killed in an overnight house fire in rural north-central Ohio died from smoke inhalation. Fire officials say three other people who were in the house have been hospitalized with what appeared to be non-life-threatening injuries. The State Fire Marshal's Office says the fire started on a front porch. The Associated Press reports there was an incubator on the porch; however, fire officials told FOX 8 News that has not yet been determined. They are still working to determine the actual cause. Officials identified the children who died as 12-year-old Faithlyn Bogavich, 4-year-old Delaney Bogavich and 1-year-old John Jeffrey Bogavich. The others injured included a 13-year-old boy. The two-story house in Jeromesville was fully engulfed in flames when firefighters arrived at the scene about 70 miles southwest of Cleveland. At least six fire departments responded.