chemical weapons, experts say there are multiple sites in the country. you d need tens of thousands of experts to go in and decommission those weapons. and they would be walking in effectively into an ongoing war. there is no cease-fire. that may require hundreds of thousands of additional peacekeeping troops. the rebels show no sign at the moment they re going to sign up for this, kate. we ll be watching as it develops, clearly, throughout the day. thank you for that. much more on syria coming up, including a one-on-one interview with senator john mccain. we ll get his take on the latest developments in just a moment. he s been a key senator, a key ally of the president in this conversation, in this debate. and you ll hear from president obama himself, addressing the nation this evening at 9:00 p.m. eastern. you can watch it right here on cnn. george zimmerman was back in police custody after an eerily familiar 911 call. his wife placed this one on monday. shelly zimmerman said