>> caller: cnn has learned u.s. special operations forces recently attacked an isis target inside syria. the u.s. believes the raid stopped plotters planning to attack the u.s., an administration official says. >> we know we need to remove daesh from raqqah. >> 2,000 to 3,000 fighters in and around raqqah according to u.s. military officials. no one knows how many other supporters exist among the population. within the next few weeks the u.s. plans along with kurdish and arab partners to try to begin to isolate the city. local ground forces backed up by u.s. military advisors will be put on roads in and out of raqqah trying to stop the flow of isis operatives. the u.s. will fly aircraft over head ready to strike when targets are identified. the fight for raqqah will begin even if the fight to retake