NEW : Official says investigators have spoken with two of the survivors . NEW : The incident was chalked up to the pilot 's failure to maintain control , she said . Officials say they are still looking for a third survivor who may be able to provide more information about what happened in that house. Autopsies show those killed in plane crash suffered blunt force trauma . The condition of the former NASA chief has been upgraded from critical to serious .
NEW : Official says investigators have spoken with two of the survivors . NEW : Officials say they are still looking for a third survivor who may be able to provide more information about what happened in that house. Autopsies show those killed in plane crash suffered blunt force trauma . The condition of the former NASA chief has been upgraded from critical to serious .