Clinton, speaking in separate interviews with CNN and Fox News, said yesterday she was still seeking information on the attacks that killed US Ambassador Chris Stevens and three other Americans and has led to numerous investigations.
But she defended the Obama administration's response to the incident and said the State Department tried to respond to the fast-moving attacks that have become a focal point of criticism from Republicans.
"We want to know who was behind it, what the motivation of the leaders and the attackers happened to be. There are still some unanswered questions," Clinton said on CNN. "It was, after all, the fog of war."
Clinton urged the Obama administration to remain cautious about working with Iran to combat fast-moving insurgents in Iraq. And she said it was unclear whether it would have turned the tide in Syria if the US had tried to help moderate rebel forces there, as she once advised.
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The former first lady's appearances came hours after the Obama administration announced the capture of a Libyan militant suspected in the Benghazi attacks. Clinton said the capture showed the US has an "an unwavering commitment" to go after anyone who would attempt to harm Americans.
A new Republican-led House select committee on Benghazi could extend the issue into the next presidential campaign.
The probe could figure into Clinton's political future if she seeks the White House again; Clinton said during the Fox interview that "I know you and your viewers have a lot of questions."
But she said the US often sends people into dangerous places to represent its national security interests and she didn't think that should change. "I don't think we should be retreating from the world," she told CNN.