Lexington firefighters say three people have been found dead inside a burning home.WLEX-TV reported the fire broke out before dawn Wednesday in the Clays Mill area of the city.Fayette County Coroner Gary Ginn told the Lexington Herald-Leader that the victims appear to be an older couple and their son, all of whom lived at the address. He declined to release names until the victims could be positively identified.Ginn told WKYT-TV that all the victims were oxygen-dependent, and oxygen tanks could have accelerated the blaze.