As they wrap up their 13-month probe into the terrorist attacks in Benghazi that killed four Americans, congressional investigators have zeroed in on a press release issued the day before the murders by White House Press Secretary Jay Carney.

They also are seeking fresh testimony from former Defense Secretary Leon Panetta.

Staffers with the House Armed Services Subcommittee on Oversight and Investigations told Fox News they have reached the preliminary conclusion – as the Obama administration has long maintained – that no military rescue or remedy was feasible on the night of September 11, 2012, when U.S. Ambassador to Libya Chris Stevens and three other Americans died amid an eight-hour assault by terrorists on the U.S. consulate in Benghazi and a nearby annex.

However, House investigators have also determined that the reason no military forces could be rallied to intervene in Benghazi is because U.S. military assets were poorly postured amid the turmoil of that period, as the eleventh anniversary of the September 11, 2001 attacks approached.

“My job was to look at the days and the weeks and the months and the years leading up to that day, and ask the question: Why weren’t we prepared, and who is responsible?” said Rep. Martha Roby, R-Ala., chair of the HASC subcommittee. “If the White House is projecting that we were safe, the White House has to take responsibility of our lack of preparedness.”