CNN The Situation Room March 20, 2013 22:08:00
Chemical weapons used. >> reporter: in a classified briefing to congress, intelligence officials said it's not clear what happened. but cnn has learned new details about how the cia is trying to figure out exactly what did happen here. u.s. intelligence operatives are now talking to rebels and defectors to see what they know. in maryland, these are being interviewed. they tell cnn military analysts are looking at the symptoms and conditions, along with reports from syrian doctors, to see if the symptoms of suffocation, and convulsions match a potential chemical attack. intelligence analysts ar...