Lima, Peru (CNN) -- 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." Demonstrators set the U.S. Consulate compound in Benghazi, Libya, on fire on September 11. The U.S. ambassador and three other U.S. nationals were killed during the attack. The Obama administration 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: Protesters