murder. an alleged hit man's startling confessions about killings for the cartels. i'm jim acosta. wolf blitzer is off today and you're in "the situation room." our breaking news, the white house says syria has used chemical weapons multiple times crossing the obama administration's red line. the intelligence community has determined that the nerve agent sarin was used by the syrian regime killing up to 150 people. president obama has decided to provide more help to syria's rebels, including military support. let's go live now to frederick pleitgen. this is just breaking. what are you hearing? >> reporter: yeah, it's very limited at this point in time. of course, they are all hard to get in touch with. i've been talking to very syrian