Story highlights "What I want to avoid is some kind of political gotcha or blame game," Clinton says

"I take this very personally," she says

Diplomats need security but "can't hang out behind walls," she adds

Secretary of State Hillary Clinton on Monday tried to douse a political firestorm over the deadly assault on a U.S. diplomatic mission in Libya, saying she's responsible for the security of American diplomatic outposts.

"I take responsibility," Clinton told CNN in an interview while on a visit to Peru. "I'm in charge of the State Department's 60,000-plus people all over the world, 275 posts. The president and the vice president wouldn't be knowledgeable about specific decisions that are made by security professionals. They're the ones who weigh all of the threats and the risks and the needs and make a considered decision."

But she said an investigation now under way will ultimately determine what happened at the U.S. Consulate in Benghazi, where Ambassador Chris Stevens and three other Americans were killed on September 11.

"I take this very personally," Clinton said. "So we're going to get to the bottom of it, and then we're going to do everything we can to work to prevent it from happening again, and then we're going to work to bring whoever did this to us to justice."

The attack took place in the eastern Libyan city that was the cradle of that country's 2011 revolution. Obama administration officials initially blamed a mob inflamed by a U.S.-produced movie that mocked Islam and its Prophet Mohammed, but later said the storming of the consulate appears to have been a terrorist attack.

Photos: Photos: Attack on U.S. mission in Benghazi Photos: Photos: Attack on U.S. mission in Benghazi Attack on U.S. mission in Benghazi – Attackers set the U.S. mission in Benghazi, Libya, on fire on September 11, 2012. The U.S. ambassador to Libya, Christopher Stevens, and three other U.S. nationals were killed during the attack. The Obama administration initially thought the attack was carried out by an angry mob responding to a video, made in the United States, that mocked Islam and the Prophet Mohammed. But the storming of the mission was later determined to have been a terrorist attack. Hide Caption 1 of 22 Photos: Photos: Attack on U.S. mission in Benghazi Attack on U.S. mission in Benghazi – Obama and Clinton stand at Andrews Air Force Base as the bodies of the four Americans killed are returned on September 14. Hide Caption 2 of 22 Photos: Photos: Attack on U.S. mission in Benghazi Attack on U.S. mission in Benghazi – A desk sits inside the burnt U.S. mission on September 13, two days after the attack. Hide Caption 3 of 22 Photos: Photos: Attack on U.S. mission in Benghazi Attack on U.S. mission in Benghazi – Damage is seen inside the U.S. mission on September 13. Hide Caption 4 of 22 Photos: Photos: Attack on U.S. mission in Benghazi Attack on U.S. mission in Benghazi – A lounge chair and umbrella float in the swimming pool of the U.S. mission on September 13. Hide Caption 5 of 22 Photos: Photos: Attack on U.S. mission in Benghazi Attack on U.S. mission in Benghazi – Demonstrators gather in Libya on September 12 to condemn the killers and voice support for the victims. Hide Caption 6 of 22 Photos: Photos: Attack on U.S. mission in Benghazi Attack on U.S. mission in Benghazi – U.S. President Barack Obama, with Secretary of State Hillary Clinton on September 12, makes a statement at the White House about Stevens' death. Hide Caption 7 of 22 Photos: Photos: Attack on U.S. mission in Benghazi Attack on U.S. mission in Benghazi – A burnt vehicle is seen at the U.S. mission in Benghazi on September 12. Hide Caption 8 of 22 Photos: Photos: Attack on U.S. mission in Benghazi Attack on U.S. mission in Benghazi – People inspect the damage on September 12. Hide Caption 9 of 22 Photos: Photos: Attack on U.S. mission in Benghazi Attack on U.S. mission in Benghazi – A small American flag is seen in the rubble on September 12. Hide Caption 10 of 22 Photos: Photos: Attack on U.S. mission in Benghazi Attack on U.S. mission in Benghazi – A man stands in part of a burned-out building of the U.S. mission on September 12. Hide Caption 11 of 22 Photos: Photos: Attack on U.S. mission in Benghazi Attack on U.S. mission in Benghazi – Smoke and fire damage is evident inside a building on September 12. Hide Caption 12 of 22 Photos: Photos: Attack on U.S. mission in Benghazi Attack on U.S. mission in Benghazi – Half-burnt debris and ash cover the floor of one of the U.S. mission buildings on September 12. Hide Caption 13 of 22 Photos: Photos: Attack on U.S. mission in Benghazi Attack on U.S. mission in Benghazi – The U.S. mission is seen in flames on September 11, the day of the attack. Hide Caption 14 of 22 Photos: Photos: Attack on U.S. mission in Benghazi Attack on U.S. mission in Benghazi – A protester reacts as the U.S. mission burns on September 11. Hide Caption 15 of 22 Photos: Photos: Attack on U.S. mission in Benghazi Attack on U.S. mission in Benghazi – A vehicle and the surrounding area are engulfed in flames on September 11. Hide Caption 16 of 22 Photos: Photos: Attack on U.S. mission in Benghazi Attack on U.S. mission in Benghazi – Flames erupt outside of a building on September 11. Hide Caption 17 of 22 Photos: Photos: Attack on U.S. mission in Benghazi Attack on U.S. mission in Benghazi – A vehicle burns during the attack on the U.S. mission on September 11. Hide Caption 18 of 22 Photos: Photos: Attack on U.S. mission in Benghazi Attack on U.S. mission in Benghazi – Onlookers record the damage from the attack on September 11. Hide Caption 19 of 22 Photos: Photos: Attack on U.S. mission in Benghazi Attack on U.S. mission in Benghazi – Onlookers walk past a burning truck and building on September 11. Hide Caption 20 of 22 Photos: Photos: Attack on U.S. mission in Benghazi Attack on U.S. mission in Benghazi – A vehicle sits smoldering in flames on September 11. Hide Caption 21 of 22 Photos: Photos: Attack on U.S. mission in Benghazi Attack on U.S. mission in Benghazi – People duck flames outside a building on September 11. Hide Caption 22 of 22

JUST WATCHED Biden, Ryan debate Benghazi attack Replay More Videos ... MUST WATCH Biden, Ryan debate Benghazi attack 04:57

JUST WATCHED Romney: Benghazi was a terrorist attack Replay More Videos ... MUST WATCH Romney: Benghazi was a terrorist attack 01:55

With criticism growing, Vice President Joe Biden said during last week's vice presidential debate that the White House did not know of requests to enhance security at Benghazi, contradicting testimony by State Department employees that requests had been made and rejected. After the debate, the White House said the vice president did not know of the requests because they were handled, as is the practice, by the State Department.

"In the wake of an attack like this, in the fog of war, there's always going to be confusion," Clinton said. "And I think it is absolutely fair to say that everyone had the same intelligence. Everyone who spoke tried to give the information that they had. As time has gone on, that information has changed. We've gotten more detail, but that's not surprising. That always happens."

She added, "What I want to avoid is some kind of political gotcha or blame game."

"I know that we're very close to an election," Clinton said. "I want to just take a step back here and say from my own experience, we are at our best as Americans when we pull together. I've done that with Democratic presidents and Republican presidents."

Her remarks drew a quick response from three Republicans on the Senate Armed Services Committee, including ranking member John McCain.

Clinton's statement of responsibility was "a laudable gesture, especially when the White House is trying to avoid any responsibility whatsoever," the Arizona senator said in a joint broadside with Sens. Lindsey Graham of South Carolina and Kelly Ayotte of New Hampshire. However, they added, "The security of Americans serving our nation everywhere in the world is ultimately the job of the commander-in-chief. The buck stops there."

Stevens, State Department computer expert Sean Smith and security contractors Glen Doherty and Tyrone Woods died in the Benghazi assault, which State Department officials now say was the work of dozens of armed men.

Clinton also described a desperate scene in the State Department during the hours of the attack, as staff tried to find out what had happened.

"This was a many-hour ordeal that we were all involved in, and I was deeply concerned as you would obviously assume, to hear about an attack," she said. Not only was the picture coming out of Libya murky, but also, "Then we couldn't find Ambassador Stevens, and we were trying desperately to figure out what happened to him and to Sean Smith and to the others who were there."

Clinton said her mission now is to make sure such an attack will never happen again, and also to ensure the work of American diplomats won't be stopped even in dangerous areas like Benghazi.

"We can't retreat. We have to continue to lead. We have to be engaged," she said. "We can't hang out behind walls." She said Stevens, who came to Benghazi on a cargo ship to start building ties with rebel leaders during last year's revolt, "knew that more than anybody."