WASHINGTON – The State Department said Tuesday that it never concluded that the consulate attack in Libya stemmed from protests over an American-made video ridiculing Islam, raising further questions about why the Obama administration used that explanation for more than a week after assailants killed the U.S. ambassador and three other Americans.

The revelation came as new documents suggested internal disagreement over appropriate levels of security before the attack, which occurred on the 11th anniversary of the Sept. 11 terror attacks on the U.S.

Briefing reporters ahead of a hotly anticipated congressional hearing Wednesday, State Department officials provided their most detailed rundown of how a peaceful day in Benghazi devolved into a sustained attack that involved multiple groups of men armed with weapons such as machine guns, rocket-propelled grenades and mortars.

But asked about the administration’s initial — and since retracted — explanation linking the violence to protests over an anti-Muslim video circulating on the Internet, one official said, “That was not our conclusion.” He called it a question for “others” to answer, without specifying. The officials spoke on condition of anonymity because they weren’t authorized to speak publicly, and provided no evidence that might suggest a case of spontaneous violence or angry protests that went too far.

The attack has become an issue in the presidential campaign, featuring prominently in Republican candidate Mitt Romney’s latest foreign policy address Monday. He called it an example of President Obama’s weakness in foreign policy matters, noting: “As the administration has finally conceded, these attacks were the deliberate work of terrorists.”

The administration counters that it has provided its best intelligence on the attack, and that it refined its explanation as more information came to light. But five days after the attack, Obama’s ambassador to the United Nations, Susan Rice, gave a series of interviews saying the administration believed the violence was unplanned and that extremists with heavier weapons “hijacked” the protest and turned it into an outright attack.

She has since denied trying to mislead Congress, and a concurrent CIA memo that was obtained by The Associated Press cited intelligence suggesting the demonstrations in Benghazi “were spontaneously inspired by the protests at the U.S. Embassy in Cairo” and “evolved into a direct assault” on the diplomatic posts by “extremists.”

Alongside defining the nature of the Benghazi attack, Congress is looking into whether adequate security was in place.

According to an email obtained Tuesday by the AP, the top State Department security official in Libya told a congressional investigator that he had argued unsuccessfully for more security in the weeks before Ambassador Chris Stevens, a State Department computer specialist and two former Navy SEALs were killed. But department officials instead wanted to “normalize operations and reduce security resources,” he wrote.

Regional security officer Eric Nordstrom, also referenced a State Department document detailing 230 security incidents in Libya from June 2011 to July 2012 that demonstrated the danger there to Americans.

Nordstrom is among the witnesses set to testify Wednesday before the House Oversight and Government Reform Committee. According to the panel’s chairman, Rep. Darrell Issa, R-Calif., and the head of a subcommittee, Rep. Jason Chaffetz, R-Utah, the State Department refused repeated requests to provide more security for U.S. diplomats in Libya.

“You will note that there were a number of incidents that targeted diplomatic missions and underscored the GoL’s (government of Libya’s) inability to secure and protect diplomatic missions,” Nordstrom’s email stated.

“This was a significant part of (the diplomatic) post’s and my argument for maintaining continued DS (diplomatic security) and DOD (Department of Defense) security assets into Sept/Oct. 2012; the GoL was overwhelmed and could not guarantee our protection.

“Sadly, that point was reaffirmed on Sept. 11, 2012, in Benghazi,” he wrote.