right back. and north korea at this moment getting ready to fire a long-range rocket. why that launch could set up a powder keg in one of the most dangerous corners of the world. i m wolf blitzer. i m wolf blitzer. you re in the situation room. captions by vitac www.vitac.com let s begin with the breaking news in a case that has gripped the entire nation. a senior law enforcement source says george zimmerman, the neighborhood watch captain who shot dead an unarmed teenager trayvon martin will, in fact, be charged. florida s special prosecutor has scheduled a news conference two hours from now. of course, we ll bring that to you live. let s go to cnn s martin savidge. he s in sanford, florida, watching all of this unfold. set the scene for us, martin. what do we know right now? reporter: we know that sanford is, of course, the epicenter and right now there is a lot of tension in this town in the leadup to that special announcement that will come from the special pr