hundreds of young belgians are fighting in syria alongside her son. marking days at the molenbeek time square. a sign reads "together against hate. "the paris attack brothers, abdeslam group on the streets, with the architect. >> translator: these are guys who met on a regular basis here in my neighborhood. there were no signs. the behavior of radicalization. that its the most intriguing. no ways of anticipating behavior like this. and this worries us even more. i think this should make us think about the capacity that isis has. >> reporter: molenbeek is now