The problem is that most of them are Portuguese...they were born in Portugal, so we can do nothing to kick them out. Everyone knows where they live and sometimes even the police knows who they are but no one acts, most of the "gangs" come from Amadora (notably Cova da Moura) and other places on the so called "Linha de Sintra", its always the same, so the situation is far from being out of control, the problem is the authorities didn´t worried to much about them but with incidents like this i am sure they will have to do something. Other important thing its worth mentioning is that most of the parents of these kids are hard working ppl, this gives the kids plenty of time to stay on the streets all day long without any kind of control and discipline...