faptions inside gaza are warning that recent events could lead to a new round of conflict in the region. jon? jon: trey, thank you. concern is growing at the pentagon that isis is mounting a comeback in syria despite the recent capture of all of its territory. lucas tomlinson explains what is behind the resurgence. >> you'll be hearing about the caliphate, it's 100% defeated. >> reporter: in march the white house declared all isis territory recaptured, but a new pentagon report says the terrorist group could be coming back in syria and returning to roots in iraq. at a refugee camp in northeast syria, there are 45,000 isis supporters and family members with minimal security watching over them according to the report. it also says the iraqi military, quote: lacked the hold forces in areas recaptured from isis, and u.s.-backed fighters in syria also, quote, lacked personnel. 10,000 isis fighters remain detained in syria, but many