vickie patton, david rivkin thank you very much. >> thank you. >> woodruff: now to the chaos in yemenh seems to be growing with each passing hour, with questions of who's in control. >> woodruff: the last vestiges of yemen's government crumbled as shiite houthi rebels advanced on aden. the pro-american president, abd- rabbo mansour hadi, had taken refuge there, but the houthis offered $100,000 dollars for his capture, and local officials said he fled on a boat. hadi's foreign minister speaking from egypt, disputed that report. >> ( translated ): until now aden is still standing and the president is still in aden and he is trying as hard as possible to withstand. >> woodruff: in washington, the state department said only that hadi has left the presidential palace. >> he is no longer at his residence, which you've seen in reporting, but we can certainly confirm. i'm not in a position to confirm any additional details from here about his location. >> woodruff: the houthi advance was aided by fighters loyal to former president ali abdullah saleh, who was ousted in 2011. the rebels now con