(Richmond, IN)--The Indiana State Fire Marshal’s Office is continuing to work to pinpoint exactly what caused Thursday morning’s house explosion on Randolph Street in Richmond.  Investigators said Thursday afternoon that it could take several days or even weeks to come up with a definitive cause.  Meanwhile, there has been no updated word on the conditions of the two residents of the home, who were both flown to the burn unit of a Level One trauma center.  That hospital refused to release their conditions Friday morning.  Those two people have been identified as 51-year-old Forest Tevis and 24-year-old Autumn Reed.  Their injuries were initially described as life-threatening.  (Photo courtesy of WHIO-TV)