strict control. and also, too, activists telling us about the tricks they're playing especial weather it comes to isis informants, leaving threats to try and make those who support isis increasingly uncomfortable. here's what one had to say. "we can only get to them by leaving messages on their door like "we know who you are." this soon stops them. some of our friends started writing the word "free" on the walls of isis buildings. then, locals started. the elderly writing it on walls, and children on chalkboards, making isis wonder who are these peopl people." clearly there is a lengthy conflict ahead. it will possibly be swifter than the brutal eight-month-long fight for mosul in iraq. there's a lot of coalition firepower facing toward raqqa. they've been dug in for quite some time, isis. you see how the streets are deserted, how we're told many cars are actually car bombs.