A massive fire claimed a historic World War Two-era hospital in Arkansas and more than 100 other buildings near Fort Smith, and was still burning on Thursday night. The Fort Chaffee fire broke out on a 90-acre former medical complex late on Wednesday, the hottest day recorded in Fort Smith history, according to the National Weather Service. Fire officials said the fire's cause was under investigation. A rash of fires has plagued Arkansas as drought and heat worsened, and heat hit 115 degrees in Fort Smith on Wednesday.