U.N. mediator Lakhdar Brahimi, left, gestures during a press briefing at the United Nations headquarters in Geneva, Switzerland, Switzerland, Tuesday, Feb 11, 2014. A second round of peace talks between the Syrian government and the opposition bogged down quickly Tuesday in recriminations about who was responsible for escalating violence that has killed hundreds in the past few days and disrupted food aid for trapped civilians. (AP Photo/Anja Niedringhaus)