department of justice. >> the department of justice has regulations that bind itself to certain procedures before issuing a subpoena. the attorney general has to approve personally and explicitly all subpoenas issued to news media organizations. >>reporter: as cook mentioned, the attorney general must sign off on each. in response, news corporation said we have not seen evidence to suggesting 11th phones or has anyone cooperated. this arose when an unidentify person speculated that the british newspaper of whether it happened, and that paper printed the speculation, and that has since mushroomed with no substantiation and there is no public timetable in the preliminary inquiry but cook says by most standards it is moving quickly because he believes the allegations involving 9/11 family members are very serious.