From CNN's Jill Doherty & Elise Labott In the most detailed explanation yet of the attack in Benghazi, Libya, that killed U.S. Ambassador Christopher Stevens and three other Americans, two senior State Department officials said there was no prior indication that an attack was imminent. The officials, who briefed reporters on background in a conference … Continue reading New details in 'unprecedented' Benghazi consulate attack – Elise Labott explains