Update: White House says violence is not the answer in Syria but attack on Assad's inner circle shows "window is closing." White House says international community needs to act in a unified way.
White House says it has no information on Syrian leader Bashar al-Assad's whereabouts; White House goes on to say the U.S. is closely monitoring Syria's military facilities and believes its chemical stockpile remains under government control.
LAUSANNE, Switzerland - Major powers and Iran negotiated into the early hours of Thursday on Tehran's nuclear program two days past their deadline, with diplomats saying prospects for a preliminary agreement were finely balanced between success and collapse. | Video