US general linked to Petraeus scandal US commander in Afghanistan, General John Allen, is being investigated for emails sent to Jill Kelley, a key figure in the scandal that brought down former CIA director David Petraeus. Photo: AP The US commander in Afghanistan, General John Allen, is under investigation for "inappropriate" emails to a woman linked to the sex scandal involving former CIA director David Petraeus, a defence official says. The revelation on Tuesday represented yet another stunning turn in a widening scandal that has jolted Washington only days after the re-election of President Barack Obama, with legislators vowing to get to the bottom of case. The Pentagon official told reporters the FBI had uncovered a trove of 30,000 pages of correspondence between Allen and Jill Kelley, a key figure in the scandal that brought down the storied former general and CIA chief. Petraeus resigned abruptly last week over an extramarital affair with his biographer, Paula Broadwell. Kelley, of Tampa, Florida, had alerted the FBI to receiving threatening emails earlier this year that were eventually traced to Broadwell. The FBI then found emails between Broadwell and Petraeus that revealed their affair. The senior US defence official, speaking on condition of anonymity, told reporters travelling with Defence Secretary Leon Panetta there was a "distinct possibility" the Allen emails were connected to the Petraeus investigation. Panetta said in a statement that his department was informed by the FBI on Sunday about the case and that he had referred it to the Pentagon's