yiesz plots to attack the united states are believed to be in the work right now in the terrorist self-proclaimed capital in syriaia. barbara starr is working the story for us.. barbara starr is working the story for us. >> reporter: growing intelligence that isis is using raqqah as a mabase of operation to plot against the united states. there are fresh kagtss the u.s. is getting ready to move on raqqah. >> inside raqqah's syria the u.s. believes terrorists are plotting to attack the u.s. and the pentagon is trying to stop it. >> there is i think a sense of urgency about what we have to co-here. because we are just not suredo here. because we are just not sure what they are up to and where and when. but we know this plot/planning is emanating from raqqah.