Justice Department . response to probe says it followed rules in scrutiny of Associated Press . Congress wants to know when attorney general recused himself from leak probe . DOJ sought to find out who told AP about al Qaeda airliner crash . NEW : AP conducted more than 100 interviews , examined documents .
Justice Dept . response to Congress says it followed rules in scrutiny of Associated Press . Congress wants to know when attorney general recused himself from leak probe . DOJ sought to find out who told AP about al Qaeda airliner plot . NEW : Investigators conducted more than 550 interviews , examined documents .