its associate head basketball coach and deputy athletic director are among those killed. the twin engine cessna crashed short of a regional airport in heavy fog. new details this morning about the hacking of a white house computer system. russian hackers were behind the invasion and u.s. officials believe they still could be inside of them right now. abc's chief investigative correspondent brian ross with this for us. >> reporter: officials say the russian hackers penetrated one of the white house's two computer systems for several months last year, forcing the white house to shut down the system for days. the hack system is not used for classified information, but is used by the white house advance and press offices, the general counsel's office and several others all dealing nonpublic information, including private details of the president's schedule. >> there is always vulnerability. that's why we have a classified system because there is less risk on the classified system. that is secure. on the unclassified system we take regular actions to prevent